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-rw-r--r--synapse/handlers/room_member.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/handlers/room_member.py b/synapse/handlers/room_member.py
index 178d7db94e..41adaf3bf3 100644
--- a/synapse/handlers/room_member.py
+++ b/synapse/handlers/room_member.py
@@ -1072,7 +1072,7 @@ class RoomMemberMasterHandler(RoomMemberHandler):
             alg, h = compute_event_reference_hash(invite_event)
             invite_hash = (invite_event.event_id, {alg: encode_base64(h)})
 
-        auth_events = invite_event.auth_events + (invite_hash,)
+        auth_events = tuple(invite_event.auth_events) + (invite_hash,)
         prev_events = (invite_hash,)
 
         # we cap depth of generated events, to ensure that they are not