diff --git a/kernel/sql/block_ref_query.go b/kernel/sql/block_ref_query.go
index e631ff20f..dda9b3e95 100644
--- a/kernel/sql/block_ref_query.go
+++ b/kernel/sql/block_ref_query.go
@@ -29,7 +29,7 @@ import (
 )
 
 func GetRefDuplicatedDefRootIDs() (ret []string) {
-	rows, err := query("SELECT DISTINCT def_block_root_id FROM `refs` GROUP BY def_block_id, def_block_root_id HAVING COUNT(*) > 1 LIMIT 1")
+	rows, err := query("SELECT DISTINCT def_block_root_id FROM `refs` GROUP BY def_block_id, def_block_root_id, block_id HAVING COUNT(*) > 1")
 	if nil != err {
 		logging.LogErrorf("sql query failed: %s", err)
 		return