All products in wishlist will disappear after one is added to the cart from wishlist.
After reload they appear again, but the response from ajax call action add_to_cart_single has content equal to the:
"<div class=\"tinv-wishlist woocommerce notfound\">\n\t<div class=\"tinv-header\">\n\t<h2></h2>\n\t</div>\n\t\t<div class=\"notfound-icon\"></div>\n\t<div class=\"spacer-small\"></div>\n\t<p class=\"h3 ooops\"><strong>Ooops.</strong></p>\n\t<p class=\"cart-empty h5 title-alt\">\n\t\t\t\t\tDein Wunschzettel ist momentan leer.\t\t\t</p>\n\n\t\t<div class=\"spacer-medium\"></div>\n\t<p class=\"return-to-shop\">\n\t\t<a class=\"sr-button-text wc-backward\" href=\"https://diamondboardshop.wp.wcd.ch/de/shop/\">Zurück zum Shop</a>\n\t</p>\n</div>"
The page I need help with: [log in to see the link]