diff --git a/src/query/src/qFill.c b/src/query/src/qFill.c
index ac44feb576..d28d99ceb8 100644
--- a/src/query/src/qFill.c
+++ b/src/query/src/qFill.c
@@ -131,7 +131,7 @@ void taosFillCopyInputDataFromOneFilePage(SFillInfo* pFillInfo, tFilePage* pInpu
   assert(pFillInfo->numOfRows == pInput->num);
   int32_t t = 0;
   
-  for(int32_t i = 0; i < pFillInfo->numOfCols; ++i) {
+  for(int32_t i = 0; i < pFillInfo->numOfCols && t < pFillInfo->numOfTags; ++i) {
     SFillColInfo* pCol = &pFillInfo->pFillCol[i];
     
     char* s = pInput->data + pCol->col.offset * pInput->num;