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-rw-r--r--synapse/storage/data_stores/main/events_bg_updates.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/storage/data_stores/main/events_bg_updates.py b/synapse/storage/data_stores/main/events_bg_updates.py
index 013242b04e..448048e11d 100644
--- a/synapse/storage/data_stores/main/events_bg_updates.py
+++ b/synapse/storage/data_stores/main/events_bg_updates.py
@@ -540,7 +540,7 @@ class EventsBackgroundUpdatesStore(BackgroundUpdateStore):
                             "event_id": event_id,
                             "label": label,
                         }
-                        for label in event_json["content"].get(LabelsField)
+                        for label in event_json["content"].get(LabelsField, [])
                     ]
                 )