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-rw-r--r--synapse/handlers/room.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
index f14f791586..530bf0ab88 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -185,6 +185,7 @@ class RoomCreationHandler(BaseHandler):
             ShadowBanError if the requester is shadow-banned.
         """
         user_id = requester.user.to_string()
+        assert self.hs.is_mine_id(user_id), "User must be our own: %s" % (user_id,)
 
         # start by allocating a new room id
         r = await self.store.get_room(old_room_id)