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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 b53e8451e5..2178e623da 100644
--- a/synapse/api/auth.py
+++ b/synapse/api/auth.py
@@ -82,7 +82,7 @@ class Auth(object):
 
     @defer.inlineCallbacks
     def check_from_context(self, room_version: str, event, context, do_sig_check=True):
-        prev_state_ids = yield context.get_prev_state_ids()
+        prev_state_ids = yield defer.ensureDeferred(context.get_prev_state_ids())
         auth_events_ids = yield self.compute_auth_events(
             event, prev_state_ids, for_verification=True
         )