diff --git a/src/sql/optimizer/ob_log_del_upd.cpp b/src/sql/optimizer/ob_log_del_upd.cpp
index 3f86cf52f1..623d3a4278 100644
--- a/src/sql/optimizer/ob_log_del_upd.cpp
+++ b/src/sql/optimizer/ob_log_del_upd.cpp
@@ -1344,10 +1344,10 @@ int ObLogDelUpd::generate_fk_lookup_part_id_expr(IndexDMLInfo &index_dml_info)
     for (int64_t i = 0; OB_SUCC(ret) && i < fk_infos->count(); i++) {
       const ObForeignKeyInfo &fk_info = fk_infos->at(i);
       ObRawExpr* fk_scan_part_expr = nullptr;
-      if (fk_info.table_id_ != fk_info.child_table_id_) {
+      if (fk_info.table_id_ != fk_info.child_table_id_ || fk_info.is_parent_table_mock_) {
         // update parent table, check child table, don't use das task to perform foreign key check
         ret = index_dml_info.fk_lookup_part_id_expr_.push_back(fk_scan_part_expr);
-      } else if (!fk_info.is_parent_table_mock_) {
+      } else {
         const uint64_t parent_table_id = fk_info.parent_table_id_;
         const ObTableSchema *parent_table_schema = NULL;
         uint64_t scan_index_tid = OB_INVALID_ID;