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-rw-r--r--synapse/handlers/federation_event.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/synapse/handlers/federation_event.py b/synapse/handlers/federation_event.py
index 766d9849f5..e4a5b64d10 100644
--- a/synapse/handlers/federation_event.py
+++ b/synapse/handlers/federation_event.py
@@ -1037,6 +1037,9 @@ class FederationEventHandler:
         # XXX: this doesn't sound right? it means that we'll end up with incomplete
         #   state.
         failed_to_fetch = desired_events - event_metadata.keys()
+        # `event_id` could be missing from `event_metadata` because it's not necessarily
+        # a state event. We've already checked that we've fetched it above.
+        failed_to_fetch.discard(event_id)
         if failed_to_fetch:
             logger.warning(
                 "Failed to fetch missing state events for %s %s",