How to debug a crash that only occurs on application shutdown? (Delphi)

Question

So, after some recent changes we discovered that one of our oldest applications is sometimes crashing on shutdown. This manifests itself either in the form of \"Runtime error 21

Answer 1

"Runtime error 216" is from Windows itself, not the Delphi exception handler. I've found that it is caused by code that runs in initialization and finalization sections of units, which execute before the Delphi exception handler kicks in. Particularly. COM objects that need to unload through finalization code running after the Delphi App has terminated will cause this and similar errors. So check that stuff.

MNG