Nodejs socket.io unhandled websocket unhandled error

[karmac2015]

I am using socket.io-stream library to transfer files between 2 node servers.

Server A: (Send File)

var clientIO = require('socket.io-client');
 var ss = require('socket.io-stream');

 var clientSocket= clientIO(`http://ServerB_Address`);
 clientSocket.on('error', (error) => {
     console.log(error);
 });

 var stream = ss.createStream({objectMode: true});
 ss(clientSocket).emit('send-file', stream, data);  
 var uploadedBytes = 0;
 var from = 0;
 var reader = fs.createReadStream(filePath, {start: from});
 reader.pipe(stream)
  .on('error', (error) => {
      console.log(error);
  })
  .on('data', (chunk) => {
      uploadedBytes += Buffer.byteLength(chunk);                                
  });

Server B: (Receive File)

var fs = require('fs');
   var io = require('socket.io')(http);
   var ss = require('socket.io-stream');

   io.on('connection', (socket) => {
       // listen to send file
       ss(socket).on('send-mail', (stream, data) => {
           console.log(`*** Begin receive file`);

           var writer = fs.createWriteStream(downloadPath, {flags: 'a'});
           stream.pipe(writer);

           var size = 0;
           stream.on('data', (chunk) => {
               size += chunk.length;
               console.log(`*** Receive ${size} from mail`);
           });

           stream.on('end', () => {
               console.log(`*** End file`);
           });

           stream.on('error', (error) => {
               console.log(`*** Error when receiving file`);
               console.log(error);
           });
       });
   });

It works fine, but when transferring file if the second node server is stopped, the app in the other server crashed and an unhandled error event was thrown

Please can anyone tell me how can I catch this error? And if there is a better way to transfer files between node servers?