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-rw-r--r--synapse/event_auth.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/synapse/event_auth.py b/synapse/event_auth.py
index f512d88145..9fc8b34346 100644
--- a/synapse/event_auth.py
+++ b/synapse/event_auth.py
@@ -76,6 +76,7 @@ def check(event, auth_events, do_sig_check=True, do_size_check=True):
         return
 
     if event.type == EventTypes.Create:
+        sender_domain = get_domain_from_id(event.sender)
         room_id_domain = get_domain_from_id(event.room_id)
         if room_id_domain != sender_domain:
             raise AuthError(