Ember.js 1.10 - Failed to execute 'setAttribute' on 'Element': '"' is not a valid attribute name

After upgrading from Ember.js 1.9 to 1.10 I got following error -

Uncaught InvalidCharacterError: Failed to execute 'setAttribute' on 'Element': '"' is not a valid attribute name.

prototype.setAttribute = function(element, name, value) {
    element.setAttribute(name, String(value));
};

Values are:

value: "" 
name: """ 
element: <span></span>

What is easiest way to find what issue might be with the upgrade and what should be fixed? The error is not very user friendly.