bug#45521: 13.0.0; C-c C-c gives "Wrong type argument: number-or-marker-p, nil"

[Tassilo Horn]

> Here's my *Backtrace*:
>
> Debugger entered--Lisp error: (wrong-type-argument number-or-marker-p nil)
>   TeX-active-master-with-quotes(t t nil t)
>   apply(TeX-active-master-with-quotes (t t nil t))
>   TeX-command-expand("%`%l%(mode)%' %T")
>   TeX-command("LaTeX" TeX-master-file nil)
>   TeX-command-master(nil)
>   funcall-interactively(TeX-command-master nil)
>   call-interactively(TeX-command-master nil nil)
>   command-execute(TeX-command-master)
>
> Is it ok like that? Or should I have sent it in a different way?

It's perfect, I'll look into it later.

Thanks,
  Tassilo