Here is the big picture.

My whole application is contained in a class.
In a module, I create an instance of the main class, call its run
method, then destroys everything.

Everything works with no crash.

Although, I get an application error (memory could not be read...) after
the "end sub" of the main sub in the main module.

Do you know how I can figure out what is wrong ?

Thanks for your hints,
Will

Go to Debug in the main menu and go to Exceptions and select under the
groupbox "When Excecption Is Thrown", select "Break into the debugger."
There might be some code that's still executing or code that is still
active somewhere else in your application.

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