Product Category Layout Error

hi,
I’ve encountered an error on some of my product category pages. The error also happens on the products within those categories.
I’m using storefront with the latest WordPress update.

The category page should look like this:
https://keukendeals.be/index.php/product-category/barbecues/

Any idea what could cause this?

The page I need help with: [log in to see the link]