Requesting phantomjs action from Nodejs App (Meteor)

Question

I am trying to render a webpage and convert it to an image with Phantomjs. When I run the phantomjs code directly through terminal it works. When I run the code through a node.js child_process request I keep getting errors such as 'select: invalid argument' - this error loops infinitely, so I have to restart the server to end the process.

Example of my phantomDriver.js:

var page = require('webpage').create(),
  system = require('system');

page.viewportSize = {
  width: 1920,
  height: 1080
};

/**
 * Check for required parameters
 */
if (system.args.length < 2) {
  console.log('Usage: report.js <some URL>');
  phantom.exit();
}

page.open('https://github.com/', function(status) {
    console.log('Page Loaded');
    page.render('github.png');
    phantom.exit();
});

My Meteor request for phantomDriver.js:

var phantomjs = Npm.require('phantomjs');
var spawn = Npm.require('child_process').spawn;

Meteor.methods({
    runPhantom: function(options){
      command = spawn(phantomjs.path, ['assets/app/phantomDriver.js', '']);
      command.stdout.on('data',  function (data) {
        console.log('stdout: ' + data);
      });
      command.stderr.on('data', function (data) {
        console.log('stderr: ' + data);
      });
      command.on('exit', function (code) {
        console.log('child process exited with code ' + code);
      });
    }
});

If I replace 'https://github.com/' with '' in the page.Open() method I get: child process exited with code 0. It seems that phantomjs is working but something is not quite right with it opening/loading a webpage?

*** Added comment: It seems then when I run page.open(url, function(status){}) any code inside the page.open function callback never gets executed, something happens prior to that that just loops infinitely <- not 100% sure but what it looks like.

Thank you