1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
index ead2198e14..b9c1cbffa5 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -172,7 +172,7 @@ class RoomCreationHandler:
         user_id = requester.user.to_string()
 
         # Check if this room is already being upgraded by another person
-        for key in self._upgrade_response_cache.pending_result_cache:
+        for key in self._upgrade_response_cache.keys():
             if key[0] == old_room_id and key[1] != user_id:
                 # Two different people are trying to upgrade the same room.
                 # Send the second an error.