feat:修复部分bug

@@ -175,9 +175,13 @@ class ExBroker
     }
     public function stopListen()
     {
+        if (isset($this->wsAcc)) {
             $this->wsAcc->close();
+        }
+        if (isset($this->wsKline)) {
             $this->wsKline->close();
         }
+    }
     public function closeAllPos()
     {
         //获取所有仓位