the responsive navbar collapse (function?) cant find the menu

I use Minamaze for this Website; http://www.emart-digital.com/

But the responsive navbar collapse (function?) cant find the menu. When i click on the navigation it chances to an undefined link: (www.emart-digital.com/undefined). How can i fix that? I no have any idea, help please.

<div id=”header-responsive”><span class=”icon-bar”></span><span class=”icon-bar”></span><span class=”icon-bar”></span><div id=”header-responsive-inner” class=”responsive-links nav-collapse collapse”><ul id=”menu-menu-2″ class=””><li class=”menu-item menu-item-type-post_type menu-item-object-page menu-item-204″> …..

I think the links in the menu are ok the problem is the nav bar responsive.

Thanks for the help.
Elvis