Fatal error with WP 5.5.1

(Forgot to say that I see the error message when accessing the front end pages that utilise the user taxonomy, and in the back end when trying to create a new Post)

Hi Pete,

To replicate the issue – blank install of WP5.5.1 and TwentyTwenty theme.

With just the LH User Taxonomies plugin activated you get no error (when trying to add a new post) but you need to register the taxonomy somewhere else. If I generate the code for a new one (from GenerateWP) and put that in a separate plugin then I get this code

// Register Custom Taxonomy
function custom_taxonomy() {

	$labels = array(
		'name'                       => _x( 'Taxonomies', 'Taxonomy General Name', 'text_domain' ),
		'singular_name'              => _x( 'Taxonomy', 'Taxonomy Singular Name', 'text_domain' ),
		'menu_name'                  => __( 'Taxonomy', 'text_domain' ),
		'all_items'                  => __( 'All Items', 'text_domain' ),
		'parent_item'                => __( 'Parent Item', 'text_domain' ),
		'parent_item_colon'          => __( 'Parent Item:', 'text_domain' ),
		'new_item_name'              => __( 'New Item Name', 'text_domain' ),
		'add_new_item'               => __( 'Add New Item', 'text_domain' ),
		'edit_item'                  => __( 'Edit Item', 'text_domain' ),
		'update_item'                => __( 'Update Item', 'text_domain' ),
		'view_item'                  => __( 'View Item', 'text_domain' ),
		'separate_items_with_commas' => __( 'Separate items with commas', 'text_domain' ),
		'add_or_remove_items'        => __( 'Add or remove items', 'text_domain' ),
		'choose_from_most_used'      => __( 'Choose from the most used', 'text_domain' ),
		'popular_items'              => __( 'Popular Items', 'text_domain' ),
		'search_items'               => __( 'Search Items', 'text_domain' ),
		'not_found'                  => __( 'Not Found', 'text_domain' ),
		'no_terms'                   => __( 'No items', 'text_domain' ),
		'items_list'                 => __( 'Items list', 'text_domain' ),
		'items_list_navigation'      => __( 'Items list navigation', 'text_domain' ),
	);
	$args = array(
		'labels'                     => $labels,
		'hierarchical'               => false,
		'public'                     => true,
		'show_ui'                    => true,
		'show_admin_column'          => true,
		'show_in_nav_menus'          => true,
		'show_tagcloud'              => true,
		'show_in_rest'               => true,
	);
	register_taxonomy( 'taxonomy', array( 'user' ), $args );

}
add_action( 'init', 'custom_taxonomy', 0 );

That will then throw the error when I try to create a post. If I comment out the show_in_rest line then it works OK, but I need to have that enabled because I’m using the block editor.

Thanks,
Ben

I think it was left over in the taxonomy registration code from when I was originally trying to use the taxonomy for users and another CPT. I think I ran into some issues with doing that, which is why I reverted it back to just assigning it to ‘user’.

What’s the best way forward? I can just remove the rest_api support from my taxonomy registration code, or will the plugin be updated to resolve the error if show_in_rest is enabled?

Thanks,
Ben