Subject: Re: bug#76252: 31.0.50; tab-line stopped working

From: Eli Zaretskii <[email-masked]>
Date: Thu, 13 Feb 2025 11:09:44 +0200

> From: Pedro Andres Aranda Gutierrez <[email-masked]>
> Date: Thu, 13 Feb 2025 09:27:37 +0100
> Cc: [email-masked]
> 
> Debug-on-error was not very helpful :(:
> 
> Entering debugger...
> apply: Wrong type argument: number-or-marker-p, (1)

Then please run Emacs under GDB:

 $ cd /path/to/emacs/src
 $ gdb ./emacs
 ...
 (gdb) break wrong_type_argument
 (gdb) run -Q

Then invoke "M-x global-tab-line-mode", and GDB should get control.
Back on GDB prompt:

 (gdb) source ./.gdbinit
 (gdb) bt

and post the backtrace here.

Thanks.