I’m getting an error

It works super. It is simple and works with more. I’m just getting an error.

Notice: Undefined offset: 1164 in wp-content / plugins / custom-permalinks-for-custom-post-types / custom-permalinks-for-custom-post-types.php on line 110

function rflms_post_type(){
    register_post_type('result', array( 
        'labels'            =>  array(
            'name'          =>      __('Results'),
            'singular_name' =>      __('Results'),
            'all_items'     =>      __('Results All'),
            'add_new'       =>      __('New Results'),
            'add_new_item'  =>      __('New Results'),
            'edit_item'     =>      __('Edit Results'),
            'view_item'     =>      __('View Results'),
            'search_items'  =>      __('Search Results'),
            'no_found'      =>      __('No Results Post Found'),
            'not_found_in_trash' => __('No Results Post in Trash')
                                ),
        'public'            =>  true,
        'publicly_queryable'=>  true,
        'show_ui'           =>  true, 
		'show_in_menu'      =>  true,
        'query_var'         =>  true,
        'show_in_nav_menus' =>  true,
		 'show_in_rest'      => true,
		 'show_admin_column' => true,
        'capability_type'   =>  'page',
        'hierarchical'      =>  true,
        'rewrite'=> [
			'slug' => _x('results', 'URL slug'),
            'with_front' => false
        ],
	    'show_in_nav_menus' => true,
        'cptp_permalink_structure' => '%results_category%/%postname%-%post_id%/',
        'menu_position'     =>  21,
        'supports'          =>  array('title','editor', 'thumbnail','page-attributes'),
        'has_archive'       =>  true
    ));
    flush_rewrite_rules();
}
add_action('init', 'rflms_post_type');

function rflms_themes_taxonomy() {  
    register_taxonomy(  
        'results_category',  
        'result',        
        array(
            'label' => __( 'Results Categories' ),
            'rewrite'=> [
               'slug' => _x('results', 'URL slug'),
               'with_front' => false
            ],
            'cptp_permalink_structure' => '/%results_category%/',
            'hierarchical'               => true,
            'public'                     => true,
            'show_ui'                    => true,
			'show_in_menu'               => true,
            'show_admin_column'          => true,
            'show_in_nav_menus'          => true,
            'query_var' => true
        ) 
    );  
}  
add_action( 'init', 'rflms_themes_taxonomy',0);

function rflms_add_taxes_to_api() {
    $taxonomies = get_taxonomies( '', 'result' );
     
    foreach( $taxonomies as $taxonomy ) {
        $taxonomy->show_in_rest = true;
    }
}
add_action( 'init', 'rflms_add_taxes_to_api', 30 );