diff --git a/source/libs/executor/src/timewindowoperator.c b/source/libs/executor/src/timewindowoperator.c
index 52b5e0eb19..25716be0f8 100644
--- a/source/libs/executor/src/timewindowoperator.c
+++ b/source/libs/executor/src/timewindowoperator.c
@@ -1582,7 +1582,6 @@ static int32_t doSessionWindowAggNext(SOperatorInfo* pOperator, SSDataBlock** pp
   SOptrBasicInfo*          pBInfo = &pInfo->binfo;
   SExprSupp*               pSup = &pOperator->exprSupp;
 
-  pInfo->cleanGroupResInfo = false;
   if (pOperator->status == OP_RES_TO_RETURN) {
     while (1) {
       doBuildResultDatablock(pOperator, &pInfo->binfo, &pInfo->groupResInfo, pInfo->aggSup.pResultBuf);
@@ -1609,6 +1608,7 @@ static int32_t doSessionWindowAggNext(SOperatorInfo* pOperator, SSDataBlock** pp
 
   SOperatorInfo* downstream = pOperator->pDownstream[0];
 
+  pInfo->cleanGroupResInfo = false;
   while (1) {
     SSDataBlock* pBlock = getNextBlockFromDownstream(pOperator, 0);
     if (pBlock == NULL) {