[perl-win32-gui-users] Can't call method STORE on an undefined value during global destruction

When some of my Win32::GUI programs exit, I get the above error message. Trapping the error (via %SIG) gives no useful information, as caller() reports that the error occurred at main.pl, line 0. Searching the web, I found a tantalizing almost-solution in this thread:

Re: [perl-win32-gui-users] Can't call method STORE on an undefined value during global destruction

When some of my Win32::GUI programs exit, I get the above error message. Trapping the error (via %SIG) gives no useful information, as caller() reports that the error occurred at main.pl, line 0. Searching the web, I found a tantalizing almost-solution in this thread: