diff --git a/src/client/src/tscSql.c b/src/client/src/tscSql.c
index ac7081ba700cfd9a65069e5d268ea7157ca3727b..acc38ac8ed5be82d0c0df19445e98bb47128589f 100644
--- a/src/client/src/tscSql.c
+++ b/src/client/src/tscSql.c
@@ -698,8 +698,10 @@ void taos_stop_query(TAOS_RES *res) {
     tscKillSTableQuery(pSql);
   } else {
     if (pSql->cmd.command < TSDB_SQL_LOCAL) {
-      assert(pSql->pRpcCtx != NULL);
-      rpcCancelRequest(pSql->pRpcCtx);
+      if (pSql->pRpcCtx != NULL) {
+        rpcCancelRequest(pSql->pRpcCtx);
+        pSql->pRpcCtx = NULL;
+      }
     }
   }