diff --git a/src/client/src/tscSql.c b/src/client/src/tscSql.c
index f02e587455b093223af26215fbea17b2879231af..4a001a2ce4f03130e6961edb6ee54e27058fab64 100644
--- a/src/client/src/tscSql.c
+++ b/src/client/src/tscSql.c
@@ -286,9 +286,11 @@ void taos_close(TAOS *taos) {
   assert(ref >= 0);
 
   if (ref > 0) {
+    tscDebug("%p %d remain sqlObjs, do not close dnodeConn:%p", pObj, ref, pObj->pDnodeConn);
     return;
   }
 
+  tscDebug("%p all sqlObj are freed, free tscObj, dnodeConn:%p", pObj, pObj->pDnodeConn);
   tscCloseTscObj(pObj);
 }
 
diff --git a/src/client/src/tscUtil.c b/src/client/src/tscUtil.c
index f06d36e0c6f2c9669651107a1e4f5ae31361a0b4..9b3f5927ab9650764ec13ae2669ee6bc98ca5486 100644
--- a/src/client/src/tscUtil.c
+++ b/src/client/src/tscUtil.c
@@ -772,6 +772,7 @@ void tscCloseTscObj(STscObj* pObj) {
   pObj->signature = NULL;
   taosTmrStopA(&(pObj->pTimer));
 
+  void* p = pObj->pDnodeConn;
   if (pObj->pDnodeConn != NULL) {
     rpcClose(pObj->pDnodeConn);
     pObj->pDnodeConn = NULL;
@@ -779,7 +780,7 @@ void tscCloseTscObj(STscObj* pObj) {
 
   pthread_mutex_destroy(&pObj->mutex);
 
-  tscDebug("%p DB connection is closed, dnodeConn:%p", pObj, pObj->pDnodeConn);
+  tscDebug("%p DB connection is closed, dnodeConn:%p", pObj, p);
   taosTFree(pObj);
 }