It's likely a React UI bug from some data that is being improperly parsed. I'll see if I can take a look at it over the weekend. Quite busy atm so ofc PRs are more than welcome but will try and find some downtime to check.
The lnurlpay response is returned succesfully but after that the page goes blank and nothing happens

Discussion
#[3] got it to work just fine with WoS LNURL and ln address so currently I’ve only had problems with #[4] ln address and lnurl. I’ll look more into this tomorrow and see if I can help out with a PR.
Made a PR for fixing the error but I couldn’t figure out a good way to display all the data that a LUD-18 object can contain so I’ll leave that to the frontend pros.