[Debut Theme] Menu isn't working on mobile

[KateHills]

Hello, 

I'm using the debut theme on my Shopify store at www.marketbritish.co.uk 

The site went live today and we've only just noticed that the hamburger menu isn't working (no drop-down) for mobile whilst only on a product page. The menu works fine on all other pages.

I have altered the code so that the shopping cart icon doesn't appear (as we aren't an e-commerce store) so this might be where the code is incorrect? I've looked in the browser console and can see these error messages. Can someone tell me how we can fix this?

Any help/advice is greatly appreciated.

[KetanKumar]

@KateHills 

i have checked its working fine

[Zworthkey]

Hii, @KateHills 
I have checked your store menu in mobile view it is working.
Thank You.

[KateHills]

Thank you for both of your quick responses, @KetanKumar & @Zworthkey  however, have you tested trying to get to the menu when you are viewing a product page for example https://www.marketbritish.co.uk/products/action-blanket

When I am viewing that page on mobile, the hamburger menu doesn't seem to be showing me the dropdown options? I've tried on multiple mobile devices - same issue.