diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index 25e7e446bd1f1114bae12fd05678474d40a32a5e..b7512ac1f04e1cbc45100afd2bf1e84bb8e26dff 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -1347,7 +1347,7 @@ static void doSessionWindowAggImpl(SOperatorInfo* pOperator, SSWindowOperatorInf
       pInfo->start = j;
     } else if (tsList[j] - pInfo->prevTs <= gap) {
       pInfo->curWindow.ekey = tsList[j];
-      //pInfo->prevTs = tsList[j];
+      pInfo->prevTs = tsList[j];
       pInfo->numOfRows += 1;
       if (j == 0 && pInfo->start != 0) {
         pInfo->numOfRows = 1;