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-rw-r--r--synapse/handlers/federation_event.py4
1 files changed, 3 insertions, 1 deletions
diff --git a/synapse/handlers/federation_event.py b/synapse/handlers/federation_event.py
index d08e48da58..7c81e3651f 100644
--- a/synapse/handlers/federation_event.py
+++ b/synapse/handlers/federation_event.py
@@ -666,7 +666,9 @@ class FederationEventHandler:
         logger.info("Processing pulled event %s", event)
 
         # these should not be outliers.
-        assert not event.internal_metadata.is_outlier()
+        assert (
+            not event.internal_metadata.is_outlier()
+        ), "pulled event unexpectedly flagged as outlier"
 
         event_id = event.event_id