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-rw-r--r--synapse/handlers/room.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
index eb638fe50a..3e41d7a46b 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -325,7 +325,8 @@ class RoomMemberHandler(BaseRoomHandler):
         )
 
         snapshot = yield self.store.snapshot_room(
-            room_id, joinee, RoomMemberEvent.TYPE, joinee
+            room_id, joinee.to_string(), RoomMemberEvent.TYPE,
+            joinee.to_string()
         )
 
         yield self._do_join(new_event, snapshot, room_host=host, do_auth=True)