And again after updating your theme all previous fixes are broken.

Woocommerce Bookings won't add the product to the cart:

https://nieniesewing.com/product/reservering-strippenkaart/

This error is given in console:

The product is not added to the cart after clicking "Boek nu". Js console says: ?wc-ajax=add_to_cart:1          Failed to load resource: the server responded with a status of 500 ()

And Woocmmerce Product bundles won't add the added product:

https://nieniesewing.com/product/mint-crepe-1090-p-m/

When clicked the  Gutterman Allesgaren *keuze "Toevoegen voor €3,95"

Only the main product is added to the cart and not with the Gutterman Allesgaren *keuze

thank you, all functions are working.

Kind regards.

And again...these errors reoccured after the latest update....Please check:

Woocommerce Bookings won't add the product to the cart:

https://nieniesewing.com/product/reservering-strippenkaart/

This error is given in console:

The product is not added to the cart after clicking "Boek nu". Js console says: ?wc-ajax=add_to_cart:1          Failed to load resource: the server responded with a status of 500 ()

And Woocmmerce Product bundles won't add the added product:

https://nieniesewing.com/product/mint-crepe-1090-p-m/

When clicked the  Gutterman Allesgaren *keuze "Toevoegen voor €3,95"

Only the main product is added to the cart and not with the Gutterman Allesgaren *keuze

Awesome! That was quick...and it works. Thanks!