diff --git a/syncapi/storage/postgres/output_room_events_topology_table.go b/syncapi/storage/postgres/output_room_events_topology_table.go
index 4362cd3f0..4a50b9a08 100644
--- a/syncapi/storage/postgres/output_room_events_topology_table.go
+++ b/syncapi/storage/postgres/output_room_events_topology_table.go
@@ -39,7 +39,8 @@ CREATE UNIQUE INDEX IF NOT EXISTS syncapi_event_topological_position_idx ON sync
 
 const insertEventInTopologySQL = "" +
 	"INSERT INTO syncapi_output_room_events_topology (event_id, topological_position, room_id)" +
-	" VALUES ($1, $2, $3)"
+	" VALUES ($1, $2, $3)" +
+	" ON CONFLICT DO NOTHING"
 
 const selectEventIDsInRangeASCSQL = "" +
 	"SELECT event_id FROM syncapi_output_room_events_topology" +