Problem with submenu - Does not appear to be plugin

Hi!

Like other on the site, I do not have access to submenus in the main menu. I already tried deactivating all plugins, it still doesn't work.

When I activate the javascript console, I get this error:

Uncaught TypeError: Cannot read property 'msie' of undefined superfish.js?ver=3.3.1:74
sf.IE7fix superfish.js?ver=3.3.1:74
$.fn.extend.showSuperfishUl superfish.js?ver=3.3.1:114
over superfish.js?ver=3.3.1:22
k admin-bar.min.js?ver=3.9:1
(anonymous function)

Website is lambda-mtl.com

Thanks!

A friend fixed it