wordpress - PHP error with versions 7.4+ ValueError: Unknown format specifier "C" in

Why am I getting sprintf(): Too few arguments here php error here while trying to use this in items_wrap on wp_nav_menu()?

$menu = wp_get_nav_menu_object('primary-menu');

$navId = $menu->term_id;
$menuId = 'menu_' . $navId;

$navUrl = get_field('social_media_url', $menuId);
$navImg = get_field('social_media_img', $menuId);

if ($navUrl && $navImg) {
     $socialOption = '<ul id="%s" class="%s">%s<li class="menu-social-option"><a href="' . esc_attr($navUrl) . '" target="_blank"><img src="' . esc_attr($navImg['url'])  . '"></a></li></ul>';
} else {
    $socialOption = '<ul id="%1$s" class="%2$s">%3$s</ul>';
}

$navArray = array(
                'theme_location' => 'primary', // Defined when registering the menu
                'menu_id'        => 'primary-menu',
                'container'      => false,
                'depth'          => 2,
                'items_wrap'     => $socialOption,
                'menu_class'     => 'navbar-nav ml-auto',
                'walker'         => new Bootstrap_NavWalker(), // This controls the display of the Bootstrap Navbar
                'fallback_cb'    => 'Bootstrap_NavWalker::fallback', // For menu fallback
            );

wp_nav_menu($navArray);

When I remove esc_url($navUrl) then I get this type of error uncaught ValueError: Unknown format specifier "C" in. This only happens with PHP versions 7.4+

Cheers

Solution:

My solution to this issue. Turns out I don't have to use sprintf again. To wrap an extra item to wp_nav_menu with ACF variables I use this function. If any of ACF variables are empty then it just returns $items which is set by Wordpress.

function add_last_nav_item($items)
        {
            $menu = wp_get_nav_menu_object('primary-menu');

            $navId = $menu->term_id;
            $menuId = 'menu_' . $navId;

            $navUrl = get_field('social_media_url', $menuId);
            $navImg = get_field('social_media_img', $menuId);
            if ($navUrl && $navImg) {
                return $items .= '<li class="menu-social-option"><a href="' . esc_attr($navUrl) . '" target="_blank"><img src="' . esc_attr($navImg['url'])  . '"></a></li>';
            } else {
                return $items;
            }
        }
        add_filter('wp_nav_menu_items', 'add_last_nav_item');


        $socialOption = '<ul id="%1$s" class="%2$s">%3$s</ul>';

Thank you @RiggsFolly for helping me figure this out