diff --git a/source/common/src/trow.c b/source/common/src/trow.c
index f64250bce6..df5bf64acf 100644
--- a/source/common/src/trow.c
+++ b/source/common/src/trow.c
@@ -585,7 +585,7 @@ int32_t tdSTSRowNew(SArray *pArray, STSchema *pTSchema, STSRow **ppRow) {
       ASSERT(pTColumn->colId == PRIMARYKEY_TIMESTAMP_COL_ID);
     } else {
       if (IS_VAR_DATA_TYPE(pTColumn->type)) {
-        if (pColVal) {
+        if (pColVal && !pColVal->isNone && !pColVal->isNull) {
           varDataLen += (pColVal->value.nData + sizeof(VarDataLenT));
           if (maxVarDataLen < (pColVal->value.nData + sizeof(VarDataLenT))) {
             maxVarDataLen = pColVal->value.nData + sizeof(VarDataLenT);