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-rw-r--r--synapse/storage/databases/main/events.py8
1 files changed, 7 insertions, 1 deletions
diff --git a/synapse/storage/databases/main/events.py b/synapse/storage/databases/main/events.py
index 40b53274fb..096ae28788 100644
--- a/synapse/storage/databases/main/events.py
+++ b/synapse/storage/databases/main/events.py
@@ -575,7 +575,13 @@ class PersistEventsStore:
 
             missing_auth_chains.clear()
 
-            for auth_id, event_type, state_key, chain_id, sequence_number in txn:
+            for (
+                auth_id,
+                event_type,
+                state_key,
+                chain_id,
+                sequence_number,
+            ) in txn.fetchall():
                 event_to_types[auth_id] = (event_type, state_key)
 
                 if chain_id is None: