hey. that's a heartbreaking bug, i'm sorry. i unfortunately didn't handle the QR code for the port, but i looked up the code and it is indeed trying to store the furthest stage as a 1-byte number, which can't go past 255. if it does, it throws an error and doesn't generate the QR code. :(
that's a devastating oversight. i will let the publisher know. i can't promise a patch; it's been difficult to get bugfixes approved in the past.