IE 11 an javascript error occured after rerender part of the page

In IE 11 we get an javascript error:

TypeError: Unable to get property 'indexOf' of undefined or null reference

This error arises on linenumber 7451 of jsf.js. The element is in IE undefined so the error is thrown. Can you please make the if statement so that there is a check if name is not undefined. In other browsers the name property is “” so the error doen’s occure.