Set new property to window object with Ember.set in version >=1.12.0


I am using ember-auth library ( It worked fine with Ember 1.11.3, now I switched to Ember 1.12.0 but my app crashes when Ember.set(window, “property”, true) is executed.

Can you help me why in Ember >= 1.12.0 is not possible to set new property to window object?