1 files changed, 1 insertions, 0 deletions
diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py
index 276de8f8d0..e54e2b322b 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -973,6 +973,7 @@ class EventCreationHandler:
         This should only be run on the instance in charge of persisting events.
         """
         assert self._is_event_writer
+        assert self.storage.persistence is not None
 
         if ratelimit:
             # We check if this is a room admin redacting an event so that we