From cbf82dddf1b8a4dec6f20820faf374f49ab7011c Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Mon, 2 Jul 2018 11:37:57 +0100
Subject: [PATCH] Ensure that we define sender_domain

---
 synapse/event_auth.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/synapse/event_auth.py b/synapse/event_auth.py
index f512d8814..9fc8b3434 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(