SharePoint 2010 Page Layout Button Javascript Error

I ran across an issue today in SharePoint 2010 where the Page Layout button would not open. It would throw the following error in Internet Explorer:

SCRIPT5007: Unable to get property ‘nodeName’ of undefined or null reference
cui.js, line 2 character 6422

The following link gave me the answer.

SharePoint 2010 – Quick Fix for Ribbon Page Layout switch JavaScript error