Show myCRED Balance in Navigation

/**
 * Insert myCRED Balance in Navigation
 * Injects extra menu items in the main menu showing the logged
 * in users balance.
 * @version 1.0
 */
add_filter( 'wp_nav_menu_items', 'mycred_pro_add_balance_in_nav', 90, 2 );
function mycred_pro_add_balance_in_nav( $items, $args ) {

    if ( $args->theme_location != 'main-menu' || ! function_exists( 'mycred' ) || ! is_user_logged_in() )
        return $items;

    $user_id = get_current_user_id();
    $mycred_types = mycred_get_types();

    foreach ( $mycred_types as $type_id => $label ) {

        $mycred = mycred( $type_id );

        if ( $mycred->exclude_user( $user_id ) ) continue;

        $balance = $mycred->get_users_balance( $user_id, $type_id );

        $items[] = '<li class="menu-item menu-item-type-post_type menu-item-balance">' . $mycred->format_creds( $balance ) . '</li>';

    }

    return $items;

}