Register Menu Item Custom Field

[mortezayung]

Hello, I got problem with adding custom field in menu. I set $depth == 0 for one custom field and it's work perfectly when i saved. But when user drag the menu item and make it 2nd depth, The custom field still show. It should to be hide because i just make it to show in 1nd depth not 2nd depth. I think this issue need to work or there is one solution that i don't know!

This is code

function custom_field( $item_id, $item, $depth ) {
    if ( $depth == 0 ) { ?>
        <p class="description description-wide">   
            Hello World
        </p>
    <?php }
}
add_action( 'wp_nav_menu_item_custom_fields', 'custom_field', 10, 3 );