1 files changed, 6 insertions, 2 deletions
diff --git a/synapse/handlers/initial_sync.py b/synapse/handlers/initial_sync.py
index 98075f48d2..cb11754bf8 100644
--- a/synapse/handlers/initial_sync.py
+++ b/synapse/handlers/initial_sync.py
@@ -293,6 +293,10 @@ class InitialSyncHandler(BaseHandler):
                 user_id, room_id, pagin_config, membership, is_peeking
             )
         elif membership == Membership.LEAVE:
+            # The member_event_id will always be available if membership is set
+            # to leave.
+            assert member_event_id
+
             result = await self._room_initial_sync_parted(
                 user_id, room_id, pagin_config, membership, member_event_id, is_peeking
             )
@@ -315,7 +319,7 @@ class InitialSyncHandler(BaseHandler):
         user_id: str,
         room_id: str,
         pagin_config: PaginationConfig,
-        membership: Membership,
+        membership: str,
         member_event_id: str,
         is_peeking: bool,
     ) -> JsonDict:
@@ -367,7 +371,7 @@ class InitialSyncHandler(BaseHandler):
         user_id: str,
         room_id: str,
         pagin_config: PaginationConfig,
-        membership: Membership,
+        membership: str,
         is_peeking: bool,
     ) -> JsonDict:
         current_state = await self.state.get_current_state(room_id=room_id)