popwid error on category pages

Hi there,

Since the recent update I get a JavaScript error on category pages, the plugin works fine on single posts and pages.

Uncaught ReferenceError: popwid is not defined

The reason being the following is not being loaded on category pages:

var popwid = {"postid":"138","ajaxurl":"http:\/\/reader.wpengine.com\/wp-admin\/admin-ajax.php"};