1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/storage/controllers/state.py b/synapse/storage/controllers/state.py
index d3a44bc876..e08f956e6e 100644
--- a/synapse/storage/controllers/state.py
+++ b/synapse/storage/controllers/state.py
@@ -346,7 +346,7 @@ class StateStorageController:
         room_id: str,
         prev_group: Optional[int],
         delta_ids: Optional[StateMap[str]],
-        current_state_ids: StateMap[str],
+        current_state_ids: Optional[StateMap[str]],
     ) -> int:
         """Store a new set of state, returning a newly assigned state group.