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-rw-r--r--synapse/handlers/federation.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index 6c0bc7eafa..351b218247 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -1413,7 +1413,7 @@ class FederationHandler(BaseHandler):
                 local_view = dict(auth_events)
                 remote_view = dict(auth_events)
                 remote_view.update({
-                    (d.type, d.state_key): d for d in different_events
+                    (d.type, d.state_key): d for d in different_events if d
                 })
 
                 new_state, prev_state = self.state_handler.resolve_events(