diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index cf63c3a078..f6c7863b84 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -5870,7 +5870,7 @@ _over:
   taosArrayDestroy(pTableIdList);
 
   if (code != TSDB_CODE_SUCCESS) {
-    tfree(*pQInfo);
+    //pQInfo already freed in initQInfo, but *pQInfo may not pointer to null; 
     *pQInfo = NULL;
   }