diff --git a/source/libs/function/src/builtinsimpl.c b/source/libs/function/src/builtinsimpl.c
index f5fb157870..a92126b1a1 100644
--- a/source/libs/function/src/builtinsimpl.c
+++ b/source/libs/function/src/builtinsimpl.c
@@ -2844,6 +2844,7 @@ void copyTupleData(SqlFunctionCtx* pCtx, int32_t rowIndex, const SSDataBlock* pS
   for (int32_t i = 0; i < pSrcBlock->info.numOfCols; ++i) {
     SColumnInfoData* pCol = taosArrayGet(pSrcBlock->pDataBlock, i);
     if ((nullList[i] = colDataIsNull_s(pCol, rowIndex)) == true) {
+      offset += pCol->info.bytes;
       continue;
     }