Marc-Andre Lemburg <m...@egenix.com> added the comment:

Update: I've been trying hard to find a short version which triggers the issue, 
but so far it seems to only trigger when using exec() from a frozen Python 
module.

There don't appear to be many ways frame->f_lineno can end up being -1 (which 
then gets translated into None in Python). _PyCode_CheckLineNumber() is one 
source I found.

Any hints where to look for the cause of this weird effect ?

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<https://bugs.python.org/issue45563>
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