Older IE is a mean grammar Nazi

Beware of IE8 and previous versions. They are grammar Nazis. One extra comma anywhere in the code and this grammar Nazi will complain. Worst of all, it will never tell you where is the extra comma. It will just complain and throw you errors at unexpected places.

Mean old Grammar NAZI.

My advise to you: If IE8 throws weird errors at you. You might have an extra comma somewhere in your code. Check your javascripts. Also check your jsons with Lint if possible.