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-rw-r--r--synapse/storage/__init__.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/synapse/storage/__init__.py b/synapse/storage/__init__.py
index 48ad4d864f..96adf20c89 100644
--- a/synapse/storage/__init__.py
+++ b/synapse/storage/__init__.py
@@ -310,6 +310,7 @@ class DataStore(RoomMemberStore, RoomStore,
                     "room_id": event.room_id,
                     "auth_id": auth_id,
                 },
+                or_ignore=True,
             )
 
         (ref_alg, ref_hash_bytes) = compute_event_reference_hash(event)