1 files changed, 1 insertions, 1 deletions

diff --git a/synapse/handlers/room_member.py b/synapse/handlers/room_member.py

index 8feba8c90a..5ec36f591d 100644
--- a/synapse/handlers/room_member.py
+++ b/synapse/handlers/room_member.py
@@ -642,7 +642,7 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
 
     async def send_membership_event(
         self,
-        requester: Requester,
+        requester: Optional[Requester],
         event: EventBase,
         context: EventContext,
         ratelimit: bool = True,