A null entry in grouping.fields[] throws a TypeError that takes down the whole grid, before any projection is built #7217

Closed
#7346
Closed
A null entry in grouping.fields[] throws a TypeError that takes down the whole grid, before any projection is built#7217
#7346
Assignees
os-litant
Labels
bugSomething isn't workingdomain:uiobjectui ui stream: fix lands on the published library or apps — objectui execution seatpriority:p3

Description

@os-warren
os-warren
opened on Sep 1, 2026

Filed by the domain:ui execution seat (session session_012wwHa4aaFybxXrfmfHioDM). Surfaced during objectui#7179's implementation by a malformed-block test the lane wrote, which it then narrowed to exclude null rather than ride the fix — correctly, since this is a different defect class from that card's silent wrong answer.

Filed unassigned.

The claim

A null entry inside grouping.fields[] crashes the entire grid. ObjectGrid's groupValueFormatter memo dereferences the entry's field property with no null guard, throwing a TypeError before any projection is built.

Confirmed PRE-EXISTING, not introduced by #7179: the lane checked the identical code at that branch's base commit 4f596e01a, where only the line number differs.

Why it is a different class from objectui#7179

#7179 is a silent wrong answer — one group labelled (empty) holding every row, no error, nothing on screen indicating a problem. This is the opposite failure mode: a loud total crash, and loud is the better half of that pair. A thrown TypeError is findable; the (empty) bucket is what cost a downstream repo a browser session to disprove.

That is also the argument for its lower priority. It fails safe in the sense that matters: nobody ships a view believing it works.

How reachable is it

That question is the card, and it is not yet answered. GroupingFieldSchema.field is a bare string and the block is authored JSON, so the reachable paths are worth enumerating before choosing a fix:

  • a hand-authored grouping.fields: [null], or a trailing comma in a source that permits it;
  • a generated or agent-written view block — this repo's premise is that agents write compact JSON, so a null from a generator is not exotic;
  • a runtime mutation from the grouping toolbar popover, if it can ever produce a hole.

If author-time validation already rejects a null entry, this is unreachable in practice and the fix is a cheap defensive guard. If it does not, the crash is a live authoring hazard and the schema should refuse it. Measure which before fixing — the answer decides whether this is a guard or a validation gap.

Already partly pinned

The harvester added by objectui#7179, collectGroupingFieldRefs in @object-ui/core, handles null correctly, and that behaviour is pinned in packages/core/src/utils/__tests__/grouping-fields.test.ts — a unit file that needs no grid to mount.

So the shared reader is already safe. What remains unguarded is ObjectGrid's own groupValueFormatter memo, which reads the raw block rather than going through the harvester. Routing it through the harvester may be the whole fix; that is a suggestion, not a ruling.

Provenance

The lane's reading, relayed by the PM. I have not independently reproduced the crash. Filed as a finding to verify — the first task is a failing test that mounts a grid with a null grouping entry.

Related: objectui#7179 (where this surfaced; its collectGroupingFieldRefs handles null and is the candidate fix route).

Metadata

Metadata

Assignees

Labels

bugSomething isn't workingdomain:uiobjectui ui stream: fix lands on the published library or apps — objectui execution seatpriority:p3

Type

No type

Projects

No projects

    Milestone

    No milestone

    Relationships

    None yet

    Development

    No branches or pull requests

    Issue actions

    , 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
     blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

    Skip to content
    A null entry in grouping.fields[] throws a TypeError that takes down the whole grid, before any projection is built #7217
    Closed
    #7346
    Closed
    A null entry in grouping.fields[] throws a TypeError that takes down the whole grid, before any projection is built#7217
    #7346
    Assignees
    os-litant
    Labels
    bugSomething isn't workingdomain:uiobjectui ui stream: fix lands on the published library or apps — objectui execution seatpriority:p3
    Description
    @os-warren
    os-warren
    opened on Sep 1, 2026
    Filed by the domain:ui execution seat (session session_012wwHa4aaFybxXrfmfHioDM). Surfaced during objectui#7179's implementation by a malformed-block test the lane wrote, which it then narrowed to exclude null rather than ride the fix — correctly, since this is a different defect class from that card's silent wrong answer.
    Filed unassigned.
    The claim
    A null entry inside grouping.fields[] crashes the entire grid. ObjectGrid's groupValueFormatter memo dereferences the entry's field property with no null guard, throwing a TypeError before any projection is built.
    Confirmed PRE-EXISTING, not introduced by #7179: the lane checked the identical code at that branch's base commit 4f596e01a, where only the line number differs.
    Why it is a different class from objectui#7179
    #7179 is a silent wrong answer — one group labelled (empty) holding every row, no error, nothing on screen indicating a problem. This is the opposite failure mode: a loud total crash, and loud is the better half of that pair. A thrown TypeError is findable; the (empty) bucket is what cost a downstream repo a browser session to disprove.
    That is also the argument for its lower priority. It fails safe in the sense that matters: nobody ships a view believing it works.
    How reachable is it
    That question is the card, and it is not yet answered. GroupingFieldSchema.field is a bare string and the block is authored JSON, so the reachable paths are worth enumerating before choosing a fix:
    • a hand-authored grouping.fields: [null], or a trailing comma in a source that permits it;
    • a generated or agent-written view block — this repo's premise is that agents write compact JSON, so a null from a generator is not exotic;
    • a runtime mutation from the grouping toolbar popover, if it can ever produce a hole.
    If author-time validation already rejects a null entry, this is unreachable in practice and the fix is a cheap defensive guard. If it does not, the crash is a live authoring hazard and the schema should refuse it. Measure which before fixing — the answer decides whether this is a guard or a validation gap.
    Already partly pinned
    The harvester added by objectui#7179, collectGroupingFieldRefs in @object-ui/core, handles null correctly, and that behaviour is pinned in packages/core/src/utils/__tests__/grouping-fields.test.ts — a unit file that needs no grid to mount.
    So the shared reader is already safe. What remains unguarded is ObjectGrid's own groupValueFormatter memo, which reads the raw block rather than going through the harvester. Routing it through the harvester may be the whole fix; that is a suggestion, not a ruling.
    Provenance
    The lane's reading, relayed by the PM. I have not independently reproduced the crash. Filed as a finding to verify — the first task is a failing test that mounts a grid with a null grouping entry.
    Related: objectui#7179 (where this surfaced; its collectGroupingFieldRefs handles null and is the candidate fix route).
    Metadata
    Metadata
    Assignees
    Labels
    bugSomething isn't workingdomain:uiobjectui ui stream: fix lands on the published library or apps — objectui execution seatpriority:p3
    Type
    No type
    Projects
    No projects
      Milestone
      No milestone
      Relationships
      None yet
      Development
      No branches or pull requests
      Issue actions
      
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

      Skip to content
      A null entry in grouping.fields[] throws a TypeError that takes down the whole grid, before any projection is built #7217
      Closed
      #7346
      Closed
      A null entry in grouping.fields[] throws a TypeError that takes down the whole grid, before any projection is built#7217
      #7346
      Assignees
      os-litant
      Labels
      bugSomething isn't workingdomain:uiobjectui ui stream: fix lands on the published library or apps — objectui execution seatpriority:p3
      Description
      @os-warren
      os-warren
      opened on Sep 1, 2026
      Filed by the domain:ui execution seat (session session_012wwHa4aaFybxXrfmfHioDM). Surfaced during objectui#7179's implementation by a malformed-block test the lane wrote, which it then narrowed to exclude null rather than ride the fix — correctly, since this is a different defect class from that card's silent wrong answer.
      Filed unassigned.
      The claim
      A null entry inside grouping.fields[] crashes the entire grid. ObjectGrid's groupValueFormatter memo dereferences the entry's field property with no null guard, throwing a TypeError before any projection is built.
      Confirmed PRE-EXISTING, not introduced by #7179: the lane checked the identical code at that branch's base commit 4f596e01a, where only the line number differs.
      Why it is a different class from objectui#7179
      #7179 is a silent wrong answer — one group labelled (empty) holding every row, no error, nothing on screen indicating a problem. This is the opposite failure mode: a loud total crash, and loud is the better half of that pair. A thrown TypeError is findable; the (empty) bucket is what cost a downstream repo a browser session to disprove.
      That is also the argument for its lower priority. It fails safe in the sense that matters: nobody ships a view believing it works.
      How reachable is it
      That question is the card, and it is not yet answered. GroupingFieldSchema.field is a bare string and the block is authored JSON, so the reachable paths are worth enumerating before choosing a fix:
      • a hand-authored grouping.fields: [null], or a trailing comma in a source that permits it;
      • a generated or agent-written view block — this repo's premise is that agents write compact JSON, so a null from a generator is not exotic;
      • a runtime mutation from the grouping toolbar popover, if it can ever produce a hole.
      If author-time validation already rejects a null entry, this is unreachable in practice and the fix is a cheap defensive guard. If it does not, the crash is a live authoring hazard and the schema should refuse it. Measure which before fixing — the answer decides whether this is a guard or a validation gap.
      Already partly pinned
      The harvester added by objectui#7179, collectGroupingFieldRefs in @object-ui/core, handles null correctly, and that behaviour is pinned in packages/core/src/utils/__tests__/grouping-fields.test.ts — a unit file that needs no grid to mount.
      So the shared reader is already safe. What remains unguarded is ObjectGrid's own groupValueFormatter memo, which reads the raw block rather than going through the harvester. Routing it through the harvester may be the whole fix; that is a suggestion, not a ruling.
      Provenance
      The lane's reading, relayed by the PM. I have not independently reproduced the crash. Filed as a finding to verify — the first task is a failing test that mounts a grid with a null grouping entry.
      Related: objectui#7179 (where this surfaced; its collectGroupingFieldRefs handles null and is the candidate fix route).
      Metadata
      Metadata
      Assignees
      Labels
      bugSomething isn't workingdomain:uiobjectui ui stream: fix lands on the published library or apps — objectui execution seatpriority:p3
      Type
      No type
      Projects
      No projects
        Milestone
        No milestone
        Relationships
        None yet
        Development
        No branches or pull requests
        Issue actions
        
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

        Skip to content
        A null entry in grouping.fields[] throws a TypeError that takes down the whole grid, before any projection is built #7217
        Closed
        #7346
        Closed
        A null entry in grouping.fields[] throws a TypeError that takes down the whole grid, before any projection is built#7217
        #7346
        Assignees
        os-litant
        Labels
        bugSomething isn't workingdomain:uiobjectui ui stream: fix lands on the published library or apps — objectui execution seatpriority:p3
        Description
        @os-warren
        os-warren
        opened on Sep 1, 2026
        Filed by the domain:ui execution seat (session session_012wwHa4aaFybxXrfmfHioDM). Surfaced during objectui#7179's implementation by a malformed-block test the lane wrote, which it then narrowed to exclude null rather than ride the fix — correctly, since this is a different defect class from that card's silent wrong answer.
        Filed unassigned.
        The claim
        A null entry inside grouping.fields[] crashes the entire grid. ObjectGrid's groupValueFormatter memo dereferences the entry's field property with no null guard, throwing a TypeError before any projection is built.
        Confirmed PRE-EXISTING, not introduced by #7179: the lane checked the identical code at that branch's base commit 4f596e01a, where only the line number differs.
        Why it is a different class from objectui#7179
        #7179 is a silent wrong answer — one group labelled (empty) holding every row, no error, nothing on screen indicating a problem. This is the opposite failure mode: a loud total crash, and loud is the better half of that pair. A thrown TypeError is findable; the (empty) bucket is what cost a downstream repo a browser session to disprove.
        That is also the argument for its lower priority. It fails safe in the sense that matters: nobody ships a view believing it works.
        How reachable is it
        That question is the card, and it is not yet answered. GroupingFieldSchema.field is a bare string and the block is authored JSON, so the reachable paths are worth enumerating before choosing a fix:
        • a hand-authored grouping.fields: [null], or a trailing comma in a source that permits it;
        • a generated or agent-written view block — this repo's premise is that agents write compact JSON, so a null from a generator is not exotic;
        • a runtime mutation from the grouping toolbar popover, if it can ever produce a hole.
        If author-time validation already rejects a null entry, this is unreachable in practice and the fix is a cheap defensive guard. If it does not, the crash is a live authoring hazard and the schema should refuse it. Measure which before fixing — the answer decides whether this is a guard or a validation gap.
        Already partly pinned
        The harvester added by objectui#7179, collectGroupingFieldRefs in @object-ui/core, handles null correctly, and that behaviour is pinned in packages/core/src/utils/__tests__/grouping-fields.test.ts — a unit file that needs no grid to mount.
        So the shared reader is already safe. What remains unguarded is ObjectGrid's own groupValueFormatter memo, which reads the raw block rather than going through the harvester. Routing it through the harvester may be the whole fix; that is a suggestion, not a ruling.
        Provenance
        The lane's reading, relayed by the PM. I have not independently reproduced the crash. Filed as a finding to verify — the first task is a failing test that mounts a grid with a null grouping entry.
        Related: objectui#7179 (where this surfaced; its collectGroupingFieldRefs handles null and is the candidate fix route).
        Metadata
        Metadata
        Assignees
        Labels
        bugSomething isn't workingdomain:uiobjectui ui stream: fix lands on the published library or apps — objectui execution seatpriority:p3
        Type
        No type
        Projects
        No projects
          Milestone
          No milestone
          Relationships
          None yet
          Development
          No branches or pull requests
          Issue actions
          
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

          Skip to content
          A null entry in grouping.fields[] throws a TypeError that takes down the whole grid, before any projection is built #7217
          Closed
          #7346
          Closed
          A null entry in grouping.fields[] throws a TypeError that takes down the whole grid, before any projection is built#7217
          #7346
          Assignees
          os-litant
          Labels
          bugSomething isn't workingdomain:uiobjectui ui stream: fix lands on the published library or apps — objectui execution seatpriority:p3
          Description
          @os-warren
          os-warren
          opened on Sep 1, 2026
          Filed by the domain:ui execution seat (session session_012wwHa4aaFybxXrfmfHioDM). Surfaced during objectui#7179's implementation by a malformed-block test the lane wrote, which it then narrowed to exclude null rather than ride the fix — correctly, since this is a different defect class from that card's silent wrong answer.
          Filed unassigned.
          The claim
          A null entry inside grouping.fields[] crashes the entire grid. ObjectGrid's groupValueFormatter memo dereferences the entry's field property with no null guard, throwing a TypeError before any projection is built.
          Confirmed PRE-EXISTING, not introduced by #7179: the lane checked the identical code at that branch's base commit 4f596e01a, where only the line number differs.
          Why it is a different class from objectui#7179
          #7179 is a silent wrong answer — one group labelled (empty) holding every row, no error, nothing on screen indicating a problem. This is the opposite failure mode: a loud total crash, and loud is the better half of that pair. A thrown TypeError is findable; the (empty) bucket is what cost a downstream repo a browser session to disprove.
          That is also the argument for its lower priority. It fails safe in the sense that matters: nobody ships a view believing it works.
          How reachable is it
          That question is the card, and it is not yet answered. GroupingFieldSchema.field is a bare string and the block is authored JSON, so the reachable paths are worth enumerating before choosing a fix:
          • a hand-authored grouping.fields: [null], or a trailing comma in a source that permits it;
          • a generated or agent-written view block — this repo's premise is that agents write compact JSON, so a null from a generator is not exotic;
          • a runtime mutation from the grouping toolbar popover, if it can ever produce a hole.
          If author-time validation already rejects a null entry, this is unreachable in practice and the fix is a cheap defensive guard. If it does not, the crash is a live authoring hazard and the schema should refuse it. Measure which before fixing — the answer decides whether this is a guard or a validation gap.
          Already partly pinned
          The harvester added by objectui#7179, collectGroupingFieldRefs in @object-ui/core, handles null correctly, and that behaviour is pinned in packages/core/src/utils/__tests__/grouping-fields.test.ts — a unit file that needs no grid to mount.
          So the shared reader is already safe. What remains unguarded is ObjectGrid's own groupValueFormatter memo, which reads the raw block rather than going through the harvester. Routing it through the harvester may be the whole fix; that is a suggestion, not a ruling.
          Provenance
          The lane's reading, relayed by the PM. I have not independently reproduced the crash. Filed as a finding to verify — the first task is a failing test that mounts a grid with a null grouping entry.
          Related: objectui#7179 (where this surfaced; its collectGroupingFieldRefs handles null and is the candidate fix route).
          Metadata
          Metadata
          Assignees
          Labels
          bugSomething isn't workingdomain:uiobjectui ui stream: fix lands on the published library or apps — objectui execution seatpriority:p3
          Type
          No type
          Projects
          No projects
            Milestone
            No milestone
            Relationships
            None yet
            Development
            No branches or pull requests
            Issue actions
            
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

            Skip to content
            A null entry in grouping.fields[] throws a TypeError that takes down the whole grid, before any projection is built #7217
            Closed
            #7346
            Closed
            A null entry in grouping.fields[] throws a TypeError that takes down the whole grid, before any projection is built#7217
            #7346
            Assignees
            os-litant
            Labels
            bugSomething isn't workingdomain:uiobjectui ui stream: fix lands on the published library or apps — objectui execution seatpriority:p3
            Description
            @os-warren
            os-warren
            opened on Sep 1, 2026
            Filed by the domain:ui execution seat (session session_012wwHa4aaFybxXrfmfHioDM). Surfaced during objectui#7179's implementation by a malformed-block test the lane wrote, which it then narrowed to exclude null rather than ride the fix — correctly, since this is a different defect class from that card's silent wrong answer.
            Filed unassigned.
            The claim
            A null entry inside grouping.fields[] crashes the entire grid. ObjectGrid's groupValueFormatter memo dereferences the entry's field property with no null guard, throwing a TypeError before any projection is built.
            Confirmed PRE-EXISTING, not introduced by #7179: the lane checked the identical code at that branch's base commit 4f596e01a, where only the line number differs.
            Why it is a different class from objectui#7179
            #7179 is a silent wrong answer — one group labelled (empty) holding every row, no error, nothing on screen indicating a problem. This is the opposite failure mode: a loud total crash, and loud is the better half of that pair. A thrown TypeError is findable; the (empty) bucket is what cost a downstream repo a browser session to disprove.
            That is also the argument for its lower priority. It fails safe in the sense that matters: nobody ships a view believing it works.
            How reachable is it
            That question is the card, and it is not yet answered. GroupingFieldSchema.field is a bare string and the block is authored JSON, so the reachable paths are worth enumerating before choosing a fix:
            • a hand-authored grouping.fields: [null], or a trailing comma in a source that permits it;
            • a generated or agent-written view block — this repo's premise is that agents write compact JSON, so a null from a generator is not exotic;
            • a runtime mutation from the grouping toolbar popover, if it can ever produce a hole.
            If author-time validation already rejects a null entry, this is unreachable in practice and the fix is a cheap defensive guard. If it does not, the crash is a live authoring hazard and the schema should refuse it. Measure which before fixing — the answer decides whether this is a guard or a validation gap.
            Already partly pinned
            The harvester added by objectui#7179, collectGroupingFieldRefs in @object-ui/core, handles null correctly, and that behaviour is pinned in packages/core/src/utils/__tests__/grouping-fields.test.ts — a unit file that needs no grid to mount.
            So the shared reader is already safe. What remains unguarded is ObjectGrid's own groupValueFormatter memo, which reads the raw block rather than going through the harvester. Routing it through the harvester may be the whole fix; that is a suggestion, not a ruling.
            Provenance
            The lane's reading, relayed by the PM. I have not independently reproduced the crash. Filed as a finding to verify — the first task is a failing test that mounts a grid with a null grouping entry.
            Related: objectui#7179 (where this surfaced; its collectGroupingFieldRefs handles null and is the candidate fix route).
            Metadata
            Metadata
            Assignees
            Labels
            bugSomething isn't workingdomain:uiobjectui ui stream: fix lands on the published library or apps — objectui execution seatpriority:p3
            Type
            No type
            Projects
            No projects
              Milestone
              No milestone
              Relationships
              None yet
              Development
              No branches or pull requests
              Issue actions
              
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

              Skip to content
              A null entry in grouping.fields[] throws a TypeError that takes down the whole grid, before any projection is built #7217
              Closed
              #7346
              Closed
              A null entry in grouping.fields[] throws a TypeError that takes down the whole grid, before any projection is built#7217
              #7346
              Assignees
              os-litant
              Labels
              bugSomething isn't workingdomain:uiobjectui ui stream: fix lands on the published library or apps — objectui execution seatpriority:p3
              Description
              @os-warren
              os-warren
              opened on Sep 1, 2026
              Filed by the domain:ui execution seat (session session_012wwHa4aaFybxXrfmfHioDM). Surfaced during objectui#7179's implementation by a malformed-block test the lane wrote, which it then narrowed to exclude null rather than ride the fix — correctly, since this is a different defect class from that card's silent wrong answer.
              Filed unassigned.
              The claim
              A null entry inside grouping.fields[] crashes the entire grid. ObjectGrid's groupValueFormatter memo dereferences the entry's field property with no null guard, throwing a TypeError before any projection is built.
              Confirmed PRE-EXISTING, not introduced by #7179: the lane checked the identical code at that branch's base commit 4f596e01a, where only the line number differs.
              Why it is a different class from objectui#7179
              #7179 is a silent wrong answer — one group labelled (empty) holding every row, no error, nothing on screen indicating a problem. This is the opposite failure mode: a loud total crash, and loud is the better half of that pair. A thrown TypeError is findable; the (empty) bucket is what cost a downstream repo a browser session to disprove.
              That is also the argument for its lower priority. It fails safe in the sense that matters: nobody ships a view believing it works.
              How reachable is it
              That question is the card, and it is not yet answered. GroupingFieldSchema.field is a bare string and the block is authored JSON, so the reachable paths are worth enumerating before choosing a fix:
              • a hand-authored grouping.fields: [null], or a trailing comma in a source that permits it;
              • a generated or agent-written view block — this repo's premise is that agents write compact JSON, so a null from a generator is not exotic;
              • a runtime mutation from the grouping toolbar popover, if it can ever produce a hole.
              If author-time validation already rejects a null entry, this is unreachable in practice and the fix is a cheap defensive guard. If it does not, the crash is a live authoring hazard and the schema should refuse it. Measure which before fixing — the answer decides whether this is a guard or a validation gap.
              Already partly pinned
              The harvester added by objectui#7179, collectGroupingFieldRefs in @object-ui/core, handles null correctly, and that behaviour is pinned in packages/core/src/utils/__tests__/grouping-fields.test.ts — a unit file that needs no grid to mount.
              So the shared reader is already safe. What remains unguarded is ObjectGrid's own groupValueFormatter memo, which reads the raw block rather than going through the harvester. Routing it through the harvester may be the whole fix; that is a suggestion, not a ruling.
              Provenance
              The lane's reading, relayed by the PM. I have not independently reproduced the crash. Filed as a finding to verify — the first task is a failing test that mounts a grid with a null grouping entry.
              Related: objectui#7179 (where this surfaced; its collectGroupingFieldRefs handles null and is the candidate fix route).
              Metadata
              Metadata
              Assignees
              Labels
              bugSomething isn't workingdomain:uiobjectui ui stream: fix lands on the published library or apps — objectui execution seatpriority:p3
              Type
              No type
              Projects
              No projects
                Milestone
                No milestone
                Relationships
                None yet
                Development
                No branches or pull requests
                Issue actions
                
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

                Skip to content
                A null entry in grouping.fields[] throws a TypeError that takes down the whole grid, before any projection is built #7217
                Closed
                #7346
                Closed
                A null entry in grouping.fields[] throws a TypeError that takes down the whole grid, before any projection is built#7217
                #7346
                Assignees
                os-litant
                Labels
                bugSomething isn't workingdomain:uiobjectui ui stream: fix lands on the published library or apps — objectui execution seatpriority:p3
                Description
                @os-warren
                os-warren
                opened on Sep 1, 2026
                Filed by the domain:ui execution seat (session session_012wwHa4aaFybxXrfmfHioDM). Surfaced during objectui#7179's implementation by a malformed-block test the lane wrote, which it then narrowed to exclude null rather than ride the fix — correctly, since this is a different defect class from that card's silent wrong answer.
                Filed unassigned.
                The claim
                A null entry inside grouping.fields[] crashes the entire grid. ObjectGrid's groupValueFormatter memo dereferences the entry's field property with no null guard, throwing a TypeError before any projection is built.
                Confirmed PRE-EXISTING, not introduced by #7179: the lane checked the identical code at that branch's base commit 4f596e01a, where only the line number differs.
                Why it is a different class from objectui#7179
                #7179 is a silent wrong answer — one group labelled (empty) holding every row, no error, nothing on screen indicating a problem. This is the opposite failure mode: a loud total crash, and loud is the better half of that pair. A thrown TypeError is findable; the (empty) bucket is what cost a downstream repo a browser session to disprove.
                That is also the argument for its lower priority. It fails safe in the sense that matters: nobody ships a view believing it works.
                How reachable is it
                That question is the card, and it is not yet answered. GroupingFieldSchema.field is a bare string and the block is authored JSON, so the reachable paths are worth enumerating before choosing a fix:
                • a hand-authored grouping.fields: [null], or a trailing comma in a source that permits it;
                • a generated or agent-written view block — this repo's premise is that agents write compact JSON, so a null from a generator is not exotic;
                • a runtime mutation from the grouping toolbar popover, if it can ever produce a hole.
                If author-time validation already rejects a null entry, this is unreachable in practice and the fix is a cheap defensive guard. If it does not, the crash is a live authoring hazard and the schema should refuse it. Measure which before fixing — the answer decides whether this is a guard or a validation gap.
                Already partly pinned
                The harvester added by objectui#7179, collectGroupingFieldRefs in @object-ui/core, handles null correctly, and that behaviour is pinned in packages/core/src/utils/__tests__/grouping-fields.test.ts — a unit file that needs no grid to mount.
                So the shared reader is already safe. What remains unguarded is ObjectGrid's own groupValueFormatter memo, which reads the raw block rather than going through the harvester. Routing it through the harvester may be the whole fix; that is a suggestion, not a ruling.
                Provenance
                The lane's reading, relayed by the PM. I have not independently reproduced the crash. Filed as a finding to verify — the first task is a failing test that mounts a grid with a null grouping entry.
                Related: objectui#7179 (where this surfaced; its collectGroupingFieldRefs handles null and is the candidate fix route).
                Metadata
                Metadata
                Assignees
                Labels
                bugSomething isn't workingdomain:uiobjectui ui stream: fix lands on the published library or apps — objectui execution seatpriority:p3
                Type
                No type
                Projects
                No projects
                  Milestone
                  No milestone
                  Relationships
                  None yet
                  Development
                  No branches or pull requests
                  Issue actions