Undefined variable: category

Hi there,

When I try to expire by changing/adding/removing a category I get following errors: (just by selecting the options from the dropdown error)

Notice: Undefined variable: category in …/wp-content/plugins/post-expirator/post-expirator.php on line 1286

Notice: Trying to get property of non-object in …/wp-content/plugins/post-expirator/post-expirator.php on line 1286

Notice: Undefined variable: category in …/wp-content/plugins/post-expirator/post-expirator.php on line 1287

Notice: Trying to get property of non-object in …/wp-content/plugins/post-expirator/post-expirator.php on line 1287

I get around 200 of those errors.
The same errors appear on ‘Post Expirator Options’ page at ‘Default Expiration Category:’.

Running WP 3.8.1

Thanks for the help.

https://wordpress.org/plugins/post-expirator/