feat:修复部分bug

@@ -175,8 +175,12 @@ class ExBroker
     }
     public function stopListen()
     {
-        $this->wsAcc->close();
-        $this->wsKline->close();
+        if (isset($this->wsAcc)) {
+            $this->wsAcc->close();
+        }
+        if (isset($this->wsKline)) {
+            $this->wsKline->close();
+        }
     }
     public function closeAllPos()
     {