WebSocketServer建立连接，客户端关闭时，服务端报错

Question

服务端

var WebSocketServer = require('ws').Server;
     console.log(WebSocketServer);
     this.m_WSServer = new WebSocketServer({port: 34567});
     
    this.m_WSServer.on('connection', function(ws) {
     
     ws.on('message', function(message) {
        console.log('34567 message',message);
      });
    
      ws.on('close', function(message) {
       
      });
      ws.on('error', function(message) {
       
      });

    });
    this.m_WSServer.on('close',function(){
      alert('m_WSServer close');
      me.closed();
    })

客户端

 this._ws = new WebSocket("ws://127.0.0.1:34567"); 

 //一段业务逻辑代码后
 this._ws.close()

在客户端关闭socket后，服务端会报

服务端的close事件不能监听到