Adding product hangs when using Virtuemart mega menu

Hi,
when I use (published) mega menu for Virtuemart I have problems with adding product to cart from product detail page.I get from debug :

'mobilecheck' is undefined

if(mobilecheck()){
bindEvent(window,'load',function(){
juxTouchMenu('juxvm_mm_147');
});
};

joomla 3.6.5
virtuemart 3.0.18

it's happend on Firefox, IE, Edge

Plaese help with that

best regards
Marcin

HI Marcin.
Thank you for using our product.
I'm sorry for this problem on your site. Please give me link your site and your account of the administrator via mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
I will check and report your issue in here,
Thank you so much for empathy,