That fixed the issue. Thank you for your fast answer and solution!
@maxrbr I have the same problem and have been searching for a solution for hours…
Where did you add the filter? Like, in which file? I thought it would be either ti-wishlist.php or ti-addtowishlist.php. But that didn’t work. And is there a specific place where to add it, or can it be whereever?
I’d really appreciate some help.