diff --git a/source/libs/executor/src/groupcacheoperator.c b/source/libs/executor/src/groupcacheoperator.c
index 00b8c3b9ae..3e9ac2b10a 100644
--- a/source/libs/executor/src/groupcacheoperator.c
+++ b/source/libs/executor/src/groupcacheoperator.c
@@ -73,6 +73,10 @@ static int32_t initGroupColsInfo(SGroupColsInfo* pCols, bool grpColsMayBeNull, S
 }
 
 static void logGroupCacheExecInfo(SGroupCacheOperatorInfo* pGrpCacheOperator) {
+  if (pGrpCacheOperator->downstreamNum <= 0 || NULL == pGrpCacheOperator->execInfo.pDownstreamBlkNum) {
+    return;
+  }
+  
   char* buf = taosMemoryMalloc(pGrpCacheOperator->downstreamNum * 32 + 100);
   if (NULL == buf) {
     return;