diff --git a/source/libs/executor/src/timewindowoperator.c b/source/libs/executor/src/timewindowoperator.c
index e0abcd96c5a7d7df63a460da8beabbbc13c5fdf6..78d1e97554eb65fd7b2d26afef8d454ca05ec9fc 100644
--- a/source/libs/executor/src/timewindowoperator.c
+++ b/source/libs/executor/src/timewindowoperator.c
@@ -3182,7 +3182,7 @@ int32_t saveSessionOutputBuf(SStreamAggSupporter* pAggSup, SResultWindowInfo* pW
 }
 
 static void doStreamSessionAggImpl(SOperatorInfo* pOperator, SSDataBlock* pSDataBlock, SSHashObj* pStUpdated,
-                                   SSHashObj* pStDeleted, bool hasEndTs) {
+                                   SSHashObj* pStDeleted, bool hasEndTs, bool addGap) {
   SExecTaskInfo*                 pTaskInfo = pOperator->pTaskInfo;
   SStreamSessionAggOperatorInfo* pInfo = pOperator->info;
   int32_t                        numOfOutput = pOperator->exprSupp.numOfExprs;
@@ -3221,7 +3221,7 @@ static void doStreamSessionAggImpl(SOperatorInfo* pOperator, SSDataBlock* pSData
     }
 
     int64_t winDelta = 0;
-    if (IS_FINAL_OP(pInfo)) {
+    if (addGap) {
       winDelta = pAggSup->gap;
     }
     code = doOneWindowAggImpl(&pInfo->twAggSup.timeWindowData, &winInfo, &pResult, i, winRows, rows, numOfOutput,
@@ -3547,7 +3547,7 @@ static SSDataBlock* doStreamSessionAgg(SOperatorInfo* pOperator) {
     }
     // the pDataBlock are always the same one, no need to call this again
     setInputDataBlock(pSup, pBlock, TSDB_ORDER_ASC, MAIN_SCAN, true);
-    doStreamSessionAggImpl(pOperator, pBlock, pInfo->pStUpdated, pInfo->pStDeleted, IS_FINAL_OP(pInfo));
+    doStreamSessionAggImpl(pOperator, pBlock, pInfo->pStUpdated, pInfo->pStDeleted, IS_FINAL_OP(pInfo), true);
     if (IS_FINAL_OP(pInfo)) {
       int32_t chIndex = getChildIndex(pBlock);
       int32_t size = taosArrayGetSize(pInfo->pChildren);
@@ -3562,7 +3562,7 @@ static SSDataBlock* doStreamSessionAgg(SOperatorInfo* pOperator) {
       }
       SOperatorInfo* pChildOp = taosArrayGetP(pInfo->pChildren, chIndex);
       setInputDataBlock(&pChildOp->exprSupp, pBlock, TSDB_ORDER_ASC, MAIN_SCAN, true);
-      doStreamSessionAggImpl(pChildOp, pBlock, NULL, NULL, true);
+      doStreamSessionAggImpl(pChildOp, pBlock, NULL, NULL, true, false);
     }
     pInfo->twAggSup.maxTs = TMAX(pInfo->twAggSup.maxTs, pBlock->info.window.ekey);
     pInfo->twAggSup.maxTs = TMAX(pInfo->twAggSup.maxTs, pBlock->info.watermark);
@@ -3767,7 +3767,7 @@ static SSDataBlock* doStreamSessionSemiAgg(SOperatorInfo* pOperator) {
     }
     // the pDataBlock are always the same one, no need to call this again
     setInputDataBlock(pSup, pBlock, TSDB_ORDER_ASC, MAIN_SCAN, true);
-    doStreamSessionAggImpl(pOperator, pBlock, pInfo->pStUpdated, NULL, false);
+    doStreamSessionAggImpl(pOperator, pBlock, pInfo->pStUpdated, NULL, false, false);
     maxTs = TMAX(pInfo->twAggSup.maxTs, pBlock->info.window.ekey);
   }