diff --git a/source/libs/executor/src/timesliceoperator.c b/source/libs/executor/src/timesliceoperator.c
index 71851fe931..88c1642654 100644
--- a/source/libs/executor/src/timesliceoperator.c
+++ b/source/libs/executor/src/timesliceoperator.c
@@ -675,11 +675,13 @@ static int32_t initGroupKeyKeeper(STimeSliceOperatorInfo* pInfo, SExprSupp* pExp
                         .pData = taosMemoryCalloc(1, pExprInfo->base.resSchema.bytes)};
       if (!key.pData) {
         taosArrayDestroyEx(pInfo->pPrevGroupKeys, destroyGroupKey);
+        pInfo->pPrevGroupKeys = NULL;
         return terrno;
       }
       if (NULL == taosArrayPush(pInfo->pPrevGroupKeys, &key)) {
         taosMemoryFree(key.pData);
         taosArrayDestroyEx(pInfo->pPrevGroupKeys, destroyGroupKey);
+        pInfo->pPrevGroupKeys = NULL;
         return terrno;
       }
     }