diff --git a/source/common/src/tdatablock.c b/source/common/src/tdatablock.c
index 43dcf2dfa9068059e105bbc2380628e1c5e55fb9..dc4e6f74527c0bac085446b370beefd46fa2bded 100644
--- a/source/common/src/tdatablock.c
+++ b/source/common/src/tdatablock.c
@@ -1135,6 +1135,7 @@ int32_t colInfoDataEnsureCapacity(SColumnInfoData* pColumn, size_t existRows, ui
 
     assert(pColumn->info.bytes);
     tmp = taosMemoryRealloc(pColumn->pData, numOfRows * pColumn->info.bytes);
+    memset(tmp, 0, numOfRows * pColumn->info.bytes);
     if (tmp == NULL) {
       return TSDB_CODE_OUT_OF_MEMORY;
     }
diff --git a/source/libs/qworker/src/qworker.c b/source/libs/qworker/src/qworker.c
index adf3588bd1966a659749491ca988ea65e0ce85ad..60ee375e2ea2966302f23af41d8858979d355307 100644
--- a/source/libs/qworker/src/qworker.c
+++ b/source/libs/qworker/src/qworker.c
@@ -1311,6 +1311,7 @@ int32_t qwProcessHb(SQWorker *mgmt, SQWMsg *qwMsg, SSchedulerHbReq *req) {
 
   if (sch->hbConnInfo.handle) {
     tmsgReleaseHandle(&sch->hbConnInfo, TAOS_CONN_SERVER);
+    sch->hbConnInfo.handle = NULL;
   }
 
   memcpy(&sch->hbConnInfo, &qwMsg->connInfo, sizeof(qwMsg->connInfo));
@@ -1331,6 +1332,7 @@ _return:
 
   if (code) {
     tmsgReleaseHandle(&qwMsg->connInfo, TAOS_CONN_SERVER);
+    qwMsg->connInfo.handle = NULL;
   }
 
   QW_DLOG("hb rsp send, handle:%p, code:%x - %s", qwMsg->connInfo.handle, code, tstrerror(code));