User blog comment:Kirkburn/Technical Update: February 17, 2016/@comment-126761-20160218193940/@comment-1757994-20160219004131

You can work around the bug by putting  (window.Wikia = window.Wikia || {}).InstantGlobals = window.Wikia.InstantGlobals || {}; in your personal common.js (or even global.js). It's a hack, but it works.