Delete all link not working

Hi,

the link “delete all” in the widget isn’t working.
The link is “https://XXX.de/?action=yith-woocompare-remove-product&id=all”

When you click on it its turning, but the products aren’t removed.
Deleting one product is working with a link like “https://XXX.de/?action=yith-woocompare-remove-product&id=58”

Any idea?
Thanks