diff --git a/synapse/storage/databases/main/events.py b/synapse/storage/databases/main/events.py
index dd6ac909e9..da6ae8024a 100644
--- a/synapse/storage/databases/main/events.py
+++ b/synapse/storage/databases/main/events.py
@@ -562,7 +562,8 @@ class PersistEventsStore:
                     #
                     # Ideally, we could additionally assert that we're only here for
                     # valid non-join membership transitions.
-                    assert delta_state.no_longer_in_room
+                    #assert delta_state.no_longer_in_room
+                    pass
 
         # Handle gathering info for the `sliding_sync_joined_rooms` table
         #