Cannot read property 'toLowerCase' of null
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	Jdlrobson
	May 10 2016, 5:48 PM

Description

Visit https://www.mediawiki.org/wiki/Beta_Features/Hovercards?debug=true
In the developer console there is an error on the following line:

if ( !bs.validExtensions[ title.getExtension().toLowerCase() ] ) {

It impacts anonymous and logged in users and does not seem to be browser dependent.