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-rw-r--r--synapse/api/auth.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/api/auth.py b/synapse/api/auth.py
index 7b213e54c8..1a47fede71 100644
--- a/synapse/api/auth.py
+++ b/synapse/api/auth.py
@@ -577,7 +577,7 @@ class Auth(object):
         key = (EventTypes.JoinRules, "", )
         join_rule_event_id = current_state_ids.get(key)
 
-        key = (EventTypes.Member, event.user_id, )
+        key = (EventTypes.Member, event.sender, )
         member_event_id = current_state_ids.get(key)
 
         key = (EventTypes.Create, "", )