Edit Balance not working anymore

Hi

Thanks for your great Plugin, I use it in my Shop and it is very helpful.
I think since the last WordPress Update I’m unable to edit the balance manually by clicking “Edit Balance”. Nothing happens. The link is “https://halb-halb.ch/wp-admin/admin.php?page=woo-wallet#”. I tried Safari and Firefox. No Error showing in Firefox Console. What can I do?

Thanks

Simon