Handle error on websocket error

server.ts

@@ -116,6 +116,7 @@ const wss = new WebSocketServer({ server: server, path: '/tracker/socket' })
 wss.on('connection', function (ws) {
   trackerServer.onWebSocketConnection(ws)
 })
+wss.on('error', err => logger.error('Error in websocket server.', err))
 
 const onHttpRequest = trackerServer.onHttpRequest.bind(trackerServer)
 app.get('/tracker/announce', (req, res) => onHttpRequest(req, res, { action: 'announce' }))