Version 6.0.6 has breaking changes

In version 6.0.6 there is a major breaking change in how the plugin works.

From the changelog:

= 6.0.6 =

• reworked main logic function to avoid EVAL
• !IMPORTANT! from this version not all php code will be executed in Widget Logic field
• if you need more php functions you can add it with using add_filter('widget_logic_allowed_functions', '[your_custom_function_here]');

I’m using function “is_tree”, for example, which has not been included in the default allowed functions list, which is:

$allowed_functions = array(
        'is_home', 'is_front_page', 'is_single', 'is_page', 'is_category',
        'is_tag', 'is_archive', 'is_search', 'is_404', 'is_user_logged_in',
        'current_user_can', 'is_active_sidebar', 'is_admin',
    );

My suggestion would be to tag a 7.0 release. If that is not possible, at least add is_tree function to the list, since it’s quite commonly used.