diff --git a/src/sql/das/ob_das_insert_op.cpp b/src/sql/das/ob_das_insert_op.cpp
index 2b98004207..8febae4d56 100644
--- a/src/sql/das/ob_das_insert_op.cpp
+++ b/src/sql/das/ob_das_insert_op.cpp
@@ -163,7 +163,7 @@ int ObDASInsertOp::insert_row_with_fetch()
   } else if (OB_FAIL(ObDMLService::init_dml_param(*ins_ctdef_, *ins_rtdef_, *snapshot_, write_branch_id_, op_alloc_, dml_param))) {
     LOG_WARN("init dml param failed", K(ret), KPC_(ins_ctdef), KPC_(ins_rtdef));
   } else if (OB_ISNULL(buf = op_alloc_.alloc(sizeof(ObDASConflictIterator)))) {
-    ret = OB_ERR_UNEXPECTED;
+    ret = OB_ALLOCATE_MEMORY_FAILED;
     LOG_WARN("fail to allocate ObDASConflictIterator", K(ret));
   } else {
     result_iter = new(buf) ObDASConflictIterator(ins_ctdef_->table_rowkey_types_,