diff --git a/source/common/src/tdataformat.c b/source/common/src/tdataformat.c
index d6ab974c6ced8305ddad0ebc86f072a08bf9c978..f379084cf558a6e9d4225f52163beb1cfea8a8ce 100644
--- a/source/common/src/tdataformat.c
+++ b/source/common/src/tdataformat.c
@@ -2503,9 +2503,11 @@ _exit:
 int32_t tColDataAddValueByBind(SColData *pColData, TAOS_MULTI_BIND *pBind) {
   int32_t code = 0;
 
-  ASSERT(pColData->type == pBind->buffer_type);
-
-  if (IS_VAR_DATA_TYPE(pBind->buffer_type)) {  // var-length data type
+  if (!(pBind->num == 1 && pBind->is_null && *pBind->is_null)) {
+    ASSERT(pColData->type == pBind->buffer_type);
+  }
+  
+  if (IS_VAR_DATA_TYPE(pColData->type)) {  // var-length data type
     for (int32_t i = 0; i < pBind->num; ++i) {
       if (pBind->is_null && pBind->is_null[i]) {
         code = tColDataAppendValueImpl[pColData->flag][CV_FLAG_NULL](pColData, NULL, 0);
diff --git a/source/libs/parser/src/parInsertStmt.c b/source/libs/parser/src/parInsertStmt.c
index 01a635e4b2d34bbb7982d45400429ac323e9547e..922a0f45ff38fba30fc4b766a3b6427026b49b36 100644
--- a/source/libs/parser/src/parInsertStmt.c
+++ b/source/libs/parser/src/parInsertStmt.c
@@ -251,7 +251,7 @@ int32_t qBindStmtColsValue(void* pBlock, TAOS_MULTI_BIND* bind, char* msgBuf, in
       goto _return;
     }
 
-    if (bind[c].buffer_type != pColSchema->type) {
+    if ((!(rowNum == 1 && bind[c].is_null && *bind[c].is_null)) && bind[c].buffer_type != pColSchema->type) { // for rowNum ==1 , connector may not set buffer_type
       code = buildInvalidOperationMsg(&pBuf, "column type mis-match with buffer type");
       goto _return;
     }