I've gotten a report from a user of one of my apps about errors and this is what was report to me -
NilObjectException -- Window1.Window1.CheckBIO%b%o<Window1.Window1>s
User said got the same erro on Mac OS 10.11 & 10.14. Also said tried my app on 10.9 and it just crashes.
Seems a NilObjectException error but I'm not sure were or why. I've only had one person report this error and my app works for most people.
I've been unable to recreate this error.