Featured image in menu wordpres

the following is working good, but it breaks down if you activate wpml, do you have any idea how to surpass that?

function ad_filter_menu($sorted_menu_objects, $args)
{
    if ($args-menu != 32)
        return $sorted_menu_objects;

    foreach ($sorted_menu_objects as $menu_object) {
        // searching for menu items linking to posts or pages
        // can add as many post types to the array
        if (in_array($menu_object-object, array('post', 'page', 'um_page'))) {
            // set the title to the post_thumbnail if available
            // thumbnail size is the second parameter of get_the_post_thumbnail()
            $menu_object-title = has_post_thumbnail($menu_object-object_id) ? get_the_post_thumbnail($menu_object-object_id, 'full') : $menu_object-title;
        }
    }

    return $sorted_menu_objects;
}

Thx in advance