Custom filter with custom taxonomy

I have a custom taxonomy register_taxonomy('type', 'blog') where blog is a custom post type.

When I use wp_dropdown_categories to create a custom filter, why it is empty?

add_action ( 'restrict_manage_posts', 'filters' );

function filters () {
    global $typenow;

    if ( 'blog' !== $typenow ) {
        return;
    }

    wp_dropdown_categories (
        array (
            'show_option_all' =>  'All',
            'taxonomy'        =>  get_taxonomy ( 'type' )
        )
    );
}

When I use others like post_tag or category then it works, but it’s empty if use my custom taxonomy.