Fix bug with getting missing auth event during join 500'ed (#6810)

* commit '7d846e870':
  Fix bug with getting missing auth event during join 500'ed (#6810)

1 files changed, 5 insertions, 1 deletions

diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py

index 76c34bf840..5338e4a0f1 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -1940,7 +1940,11 @@ class FederationHandler(BaseHandler):
 
         for e_id in missing_auth_events:
             m_ev = yield self.federation_client.get_pdu(
-                [origin], e_id, room_version=room_version, outlier=True, timeout=10000
+                [origin],
+                e_id,
+                room_version=room_version.identifier,
+                outlier=True,
+                timeout=10000,
             )
             if m_ev and m_ev.event_id == e_id:
                 event_map[e_id] = m_ev