<div class="main-menu">
  <div id="mobile-menu">
    <?php if ( has_nav_menu( 'primary' ) ) {
        wp_nav_menu(array(
            'theme_location' => 'primary',
            'container'       => false,
            'menu_class'      => '',
            'echo'            => true,
            'depth'             => 3,
            'items_wrap'      => '<ul class="dustrial-main-menu">%3$s</ul>',
            'walker' => new Dustrial_navwalker()
        ));
    } else {
      if ( is_user_logged_in() ) {
        echo '<ul id="menu" class="nav navbar-nav navbar-right nav-sideb fallbackcd-menu-item"><li><a class="fallbackcd" href="' . esc_url( admin_url( 'nav-menus.php' ) ) . '">' . esc_html__( 'Add a menu', 'dustrial' ) . '</a></li></ul>';
      }
    } ?>
  </div>
</div>