emberjs/ember.js#12169 TypeError

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  queryParams: ['foo'],
  foo: ''
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  beforeModel(params) {
    if (!params.foo) {
      this.transitionTo('/?foo=bar');
    }
  }
});

twiddle.json

{
  "version": "0.7.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.4/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.4.4/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.4/ember-template-compiler.js"
  }
}