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-rw-r--r--synapse/storage/databases/main/relations.py4
1 files changed, 3 insertions, 1 deletions
diff --git a/synapse/storage/databases/main/relations.py b/synapse/storage/databases/main/relations.py
index c4869d64e6..af2334a65e 100644
--- a/synapse/storage/databases/main/relations.py
+++ b/synapse/storage/databases/main/relations.py
@@ -857,7 +857,9 @@ class RelationsWorkerStore(SQLBaseStore):
         summaries = await self._get_thread_summaries(events_by_id.keys())
         # Only fetch participated for a limited selection based on what had
         # summaries.
-        participated = await self._get_threads_participated(summaries.keys(), user_id)
+        participated = await self._get_threads_participated(
+            [event_id for event_id, summary in summaries.items() if summary], user_id
+        )
         for event_id, summary in summaries.items():
             if summary:
                 thread_count, latest_thread_event, edit = summary