Error on Edit Category page of admin

While using this plugin, alongside a Dynamic Widgets plugin to allow custom widget sidebars per page/post/category/etc… and all work, except Categories. When trying to add a class to a widget on the Edit Category page, I get the following errors.

This one is above all widgets:
Notice: Trying to get property of non-object in /nas/wp/www/cluster-1997/tpain/wp-content/plugins/zigwidgetclass/zigwidgetclass.php on line 102

And this one displays if I try saving a class:
Notice: Undefined index: post_id in /nas/wp/www/cluster-1997/tpain/wp-content/plugins/wp-page-widget/wp-page-widgets.php on line 1037

Any help would be great appreciated!

https://www.ads-software.com/plugins/zigwidgetclass/