diff --git a/source/client/src/clientMain.c b/source/client/src/clientMain.c
index 6f8cef7c0d50aff6dd76903691a0fc3521230d85..7d8026f31439c5e29e842f70ced6b1fb19fdcf56 100644
--- a/source/client/src/clientMain.c
+++ b/source/client/src/clientMain.c
@@ -222,7 +222,9 @@ void taos_kill_query(TAOS *taos) {
 
   int64_t  rid = *(int64_t *)taos;
   STscObj *pTscObj = acquireTscObj(rid);
-  stopAllRequests(pTscObj->pRequests);
+  if (pTscObj) {
+    stopAllRequests(pTscObj->pRequests);
+  }
   releaseTscObj(rid);
 }
 
diff --git a/tools/shell/src/shellEngine.c b/tools/shell/src/shellEngine.c
index fd0ea6032357db68fc523a61f56de6aa0df54017..28375d8a35f970ed5025237a5e2cb3a18ee5d2db 100644
--- a/tools/shell/src/shellEngine.c
+++ b/tools/shell/src/shellEngine.c
@@ -998,7 +998,9 @@ void *shellCancelHandler(void *arg) {
 		shell.stop_query = true;
 	} else {
 #endif
-		taos_kill_query(shell.conn);
+    if (shell.conn) {
+		  taos_kill_query(shell.conn);
+		}
 #ifdef WEBSOCKET
 	}
 #endif