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-rw-r--r--synapse/handlers/federation.py11
1 files changed, 7 insertions, 4 deletions
diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index 8b5ac5d6c4..31c09365e3 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -361,10 +361,13 @@ class FederationHandler(BaseHandler):
 
         tried_domains = set(likely_domains)
 
-        states = yield defer.gatherResults({
-            e: self.state_handler.resolve_state_groups([e])[1]
-            for e in extremities.keys()
-        })
+        event_ids = list(extremities.keys())
+
+        states = yield defer.gatherResults([
+            self.state_handler.resolve_state_groups([e])[1]
+            for e in event_ids
+        ])
+        states = dict(zip(event_ids, states))
 
         for e_id, _ in sorted_extremeties_tuple:
             likely_domains = get_domains_from_state(states[e_id])[0]