Have a very strange one, various customers have reported they can’t add products to cart, while we can and we have the odd one, around 90% of customer in the last 2 days have emailed to say they can’t add to cart and the cart is empty.
It’s random but I can’t not see how to resolve
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Yes, we know about this, but you use 2.8 theme version and WC 3.1.1, very likely update of the theme will help you to solve the problem of add to cart. We didn’t find critical compatibility errors of our theme with WC, except outdated files. Or try to downgrade woocommerce version http://prntscr.com/fxn40y
Create backup of your files, database and theme options (Theme Options > Import/Export > Options > Export Options) to be able to restore the site to previous state if something goes wrong.