diff --git a/src/client/src/tscSql.c b/src/client/src/tscSql.c
index a9ec33c078c2192054efc885250a3e994b947784..7534a324099fff01cf4ca47a1da51800ec3c3fb7 100644
--- a/src/client/src/tscSql.c
+++ b/src/client/src/tscSql.c
@@ -591,7 +591,10 @@ void taos_free_result_imp(TAOS_RES *res, int keepCmd) {
     tscProcessSql(pSql);
   
     // waits for response and then goes on
-    sem_wait(&pSql->rspSem);
+    STscObj* pTscObj = pSql->pTscObj;
+    if (pTscObj->pSql == pSql) {
+      sem_wait(&pSql->rspSem);
+    }
   } else { // if no free resource msg is sent to vnode, we free this object immediately.
     STscObj* pTscObj = pSql->pTscObj;