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From: Ralf Fassel <ralfixx@gmx.de>
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Subject: Re: Function behaves differently when debugged
Date: Tue, 15 May 2018 16:48:32 +0200
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* Matthias Pfeifer <pfemat@web.de>
| I bind it to some key in ibuffer-mode. it should print the path to a
| buffer's file. When point is on a line of a buffer that is not backed by a
| file (eg *Messages*) then i get this output:
>
| wrong type argument: strinp, nil

You could set the variable debug-on-error to t to see where the error
occurs and protect that function call by 'stringp'.

| Also I do not understand why my function behaves differently when my
| defun is debugged and when it run without debugging.

Probably because the current buffer query function does not return
'nil' when you are in the debugging console...

HTH
R'