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-rw-r--r--synapse/handlers/room_member.py5
1 files changed, 3 insertions, 2 deletions
diff --git a/synapse/handlers/room_member.py b/synapse/handlers/room_member.py
index 0d4a3f4677..b6010bb41e 100644
--- a/synapse/handlers/room_member.py
+++ b/synapse/handlers/room_member.py
@@ -341,9 +341,10 @@ class RoomMemberHandler(object):
         prev_events_and_hashes = yield self.store.get_prev_events_for_room(
             room_id,
         )
-        latest_event_ids = (
+        latest_event_ids = [
             event_id for (event_id, _, _) in prev_events_and_hashes
-        )
+        ]
+
         current_state_ids = yield self.state_handler.get_current_state_ids(
             room_id, latest_event_ids=latest_event_ids,
         )