capybara-zombie server segmentation fault

executer.js

var net = require('net'),
    util = require('util'),
    zombie = require('zombie'),
    browser = new zombie.Browser,
    buffer = "";

net.createServer(function (socket) {
    socket.setEncoding('utf8');

    socket.on('data', function (data) {
        buffer += data;
    });

    socket.on('end', function () {
        console.log('Server received data: ' + buffer);
        eval(buffer);
        buffer = "";
    });
}).listen(8124, 'localhost');

console.log('Server running at http://127.0.0.1:8124/');

var socket = net.createConnection(8124);
socket.on('connect', function () {
    console.log('Connected to server at http://127.0.0.1:8124/');
    var command =   'browser.visit("http://google.com", function (err, browser, status) {'
                  + '    console.log(status); '
                  + '}); '
                  + 'socket.end();';
    socket.end(command);
});