diff --git a/siteupdate/python-teresco/siteupdate.py b/siteupdate/python-teresco/siteupdate.py
index cea1f296..118c5f85 100755
--- a/siteupdate/python-teresco/siteupdate.py
+++ b/siteupdate/python-teresco/siteupdate.py
@@ -2791,6 +2791,7 @@ def run(self):
 for line in graph_data.waypoint_naming_log:
     logfile.write(line + '\n')
 logfile.close()
+graph_data.waypoint_naming_log = None
 
 # create list of graph information for the DB
 graph_list = []