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-rw-r--r--synapse/storage/events.py4
1 files changed, 3 insertions, 1 deletions
diff --git a/synapse/storage/events.py b/synapse/storage/events.py
index bf4f3ee92a..dc0b3c2eba 100644
--- a/synapse/storage/events.py
+++ b/synapse/storage/events.py
@@ -549,7 +549,9 @@ class EventsStore(EventsWorkerStore):
             if ctx.state_group in state_groups_map:
                 continue
 
-            state_groups_map[ctx.state_group] = yield ctx.get_current_state_ids(self)
+            current_state_ids = ctx.get_cached_current_state_ids()
+            if current_state_ids is not None:
+                state_groups_map[ctx.state_group] = current_state_ids
 
         # We need to map the event_ids to their state groups. First, let's
         # check if the event is one we're persisting, in which case we can