diff --git a/src/storage/access/ob_multiple_merge.cpp b/src/storage/access/ob_multiple_merge.cpp
index bef3769dda..c1a837173a 100644
--- a/src/storage/access/ob_multiple_merge.cpp
+++ b/src/storage/access/ob_multiple_merge.cpp
@@ -1326,10 +1326,14 @@ int ObMultipleMerge::prepare_tables_from_iterator(ObTableStoreIterator &table_it
         ++memtable_cnt;
         if (table_ptr->is_direct_load_memtable()) {
           ObDDLMemtable *ddl_memtable = nullptr;
-          if (OB_FAIL((static_cast<ObDDLKV*>(table_ptr)->get_ddl_memtable(0, ddl_memtable)))) {
-            LOG_WARN("fail to get ddl memtable but ignore the failure, return nullpoint", K(ret));
-          } else if (OB_ISNULL(ddl_memtable)) {
-            continue;
+          if (OB_FAIL((static_cast<ObDDLKV*>(table_ptr)->get_first_ddl_memtable(ddl_memtable)))) {
+            if (ret == OB_ENTRY_NOT_EXIST) {
+              // memtable is null, ignore the ddl_kv
+              ret = OB_SUCCESS;
+              continue;
+            } else {
+              LOG_WARN("fail to get ddl memtable", K(ret));
+            }
           } else {
             target_table_ptr = ddl_memtable;
           }
diff --git a/src/storage/ddl/ob_tablet_ddl_kv.cpp b/src/storage/ddl/ob_tablet_ddl_kv.cpp
index 2cd40f8bb0..12efc6d352 100644
--- a/src/storage/ddl/ob_tablet_ddl_kv.cpp
+++ b/src/storage/ddl/ob_tablet_ddl_kv.cpp
@@ -1011,6 +1011,11 @@ int ObDDLKV::get_ddl_memtable(const int64_t cg_idx, ObDDLMemtable *&ddl_memtable
   return ret;
 }
 
+int ObDDLKV::get_first_ddl_memtable(ObDDLMemtable *&ddl_memtable)
+{
+  return get_ddl_memtable(0, ddl_memtable);
+}
+
 int ObDDLKV::set_macro_block(
     ObTablet &tablet,
     const ObDDLMacroBlock &macro_block,
diff --git a/src/storage/ddl/ob_tablet_ddl_kv.h b/src/storage/ddl/ob_tablet_ddl_kv.h
index d72bc4dd96..21d025a538 100644
--- a/src/storage/ddl/ob_tablet_ddl_kv.h
+++ b/src/storage/ddl/ob_tablet_ddl_kv.h
@@ -322,6 +322,7 @@ public:
   int64_t get_macro_block_cnt() const { return macro_block_count_; }
   int create_ddl_memtable(ObTablet &tablet, const ObITable::TableKey &table_key, ObDDLMemtable *&ddl_memtable);
   int get_ddl_memtable(const int64_t cg_idx, ObDDLMemtable *&ddl_memtable);
+  int get_first_ddl_memtable(ObDDLMemtable *&ddl_memtable);
   ObIArray<ObDDLMemtable *> &get_ddl_memtables() { return ddl_memtables_; }
   void inc_pending_cnt(); // used by ddl kv pending guard
   void dec_pending_cnt();