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-rw-r--r--synapse/storage/databases/main/event_federation.py5
1 files changed, 4 insertions, 1 deletions
diff --git a/synapse/storage/databases/main/event_federation.py b/synapse/storage/databases/main/event_federation.py
index 270b30800b..a556f17dac 100644
--- a/synapse/storage/databases/main/event_federation.py
+++ b/synapse/storage/databases/main/event_federation.py
@@ -1432,7 +1432,10 @@ class EventFederationWorkerStore(EventsWorkerStore, SignatureWorkerStore, SQLBas
 
             if room_version.event_format == EventFormatVersions.V1:
                 for prev_event_tuple in prev_events:
-                    if not isinstance(prev_event_tuple, list) or len(prev_events) != 2:
+                    if (
+                        not isinstance(prev_event_tuple, list)
+                        or len(prev_event_tuple) != 2
+                    ):
                         logger.info("Invalid prev_events for %s", event_id)
                         break