I just noticed the following in the debug.log

[06-Aug-2019 11:45:35 UTC] PHP Notice:  Undefined variable: post_type_obj in /www/htdocs/w01174e1/wp-dev/wp-content/plugins/wpfront-user-role-editor-personal-pro/includes/ppro/custom-post/class-customize-capabilities-pro.php on line 72
[06-Aug-2019 11:45:35 UTC] PHP Notice:  Trying to get property '_builtin' of non-object in /www/htdocs/w01174e1/wp-dev/wp-content/plugins/wpfront-user-role-editor-personal-pro/includes/custom-post/class-customize-capabilities.php on line 105
[06-Aug-2019 11:45:35 UTC] PHP Notice:  Trying to get property 'show_ui' of non-object in /www/htdocs/w01174e1/wp-dev/wp-content/plugins/wpfront-user-role-editor-personal-pro/includes/custom-post/class-customize-capabilities.php on line 109
[06-Aug-2019 11:45:35 UTC] PHP Notice:  Trying to get property 'capability_type' of non-object in /www/htdocs/w01174e1/wp-dev/wp-content/plugins/wpfront-user-role-editor-personal-pro/includes/custom-post/class-customize-capabilities.php on line 109
[06-Aug-2019 11:45:35 UTC] PHP Notice:  Trying to get property 'capability_type' of non-object in /www/htdocs/w01174e1/wp-dev/wp-content/plugins/wpfront-user-role-editor-personal-pro/includes/ppro/custom-post/class-customize-capabilities-pro.php on line 104

These lines seem to be repeated for every page load. Perhaps this has something to do with the warning issue?