In Ember 1.12.1 I got the following error:
Uncaught TypeError: Cannot read property 'currentHandlerInfos' of null.I tried to debug this and when I do this.get('router') I get function Class();

On a page where the breadcrumbs are working I also did this.get('router') and there I received a class with the properties as expected.

Do you have an idea why this is happening? Meanwhile I'll also try to fix it.