Editing custom post type show warning when activate author sreen element in screen option

[code9fair]

panel: Author

Warning: array_filter() expects parameter 1 to be array, null given in \wp-includes\class-wp-user-query.php on line 452

Warning: array_keys() expects parameter 1 to be array, null given in \wordpress\wp-includes\class-wp-user-query.php on line 452

Warning: in_array() expects parameter 2 to be array, null given in \wordpress\wp-includes\class-wp-user-query.php on line 455

[sabernhardt]

Hi and thanks for the report!

Could you test whether this happens on regular post and page types in addition to a custom post type?

I also think this involves a plugin, so please try deactivating plugins until the errors disappear to locate the problem. (You probably need to keep two: the plugin that creates the custom post type plus Classic Editor or a similar plugin.)

[code9fair]

This happen when use custom post type with plugin. But use function register_post_type of WordPress to create this custom post type.

[code9fair]

It's happen because has new blank line in plugin file. When remove empty line the Warning line disappear.