Pull through featured image in a custom menu

<?php
    $navMenu = wp_get_nav_menu_items(6);                                                    
    foreach ($navMenu as $menu) {                            
        echo '<li style="background-image:url( '. get_the_post_thumbnail_url( $menu->object_id ) .' )">';
        echo '<a href="'. $menu->url .'">'. $menu->title .'</a>';
    }
?>

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