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The problem is that CHECK_TCL_APPARTMENT is called in
Tkapp_CreateFileHandler() and Tkapp_DeleteFileHandler(). 
The CHECK_TCL_APPARTMENT macro uses self which is NULL when
called through the module.  Checking if (self == NULL)
before calling CHECK_TCL_APPARTMENT would prevent the crash,
but I'm not certain this is correct.

As a workaround, you should be able to access create/delete
filehandler through the instance:

   w.tk.createfilehandler(...)

instead of Tkinter.createfilehandler(...).