org-export raises stringp nil error

[Lele Gaifax <lele@metapensiero.it>]

Hi all,

first of all, apologies if this is not the right place for the
following...

Using current emacs-snapshot[1], trying to export even the following
very simple file:

  # -*- mode: org; coding: utf-8 -*-

  * hi

    http://www.gnu.org/

to HTML results in this error:

  org-export-protect-sub-super: Wrong type argument: stringp, nil

with the following traceback:

  string-match("\\([^\\\\]\\)\\([_^]\\)" nil)
  org-export-protect-sub-super(nil)
  org-export-normalize-links()
  org-export-preprocess-string(#("# -*- mode: org; coding: utf-8 -*-\n\n* hi\n\n  http://www.gnu.org/\n" 0 34 (fontified t font-lock-fontified t face font-lock-comment-face) 34 36 (fontified t) 36 38 (fontified t face org-level-1) 38 40 (fontified t face org-level-1) 40 44 (fontified t) 44 62 (fontified t org-no-flyspell t mouse-face highlight face org-link keymap (keymap (follow-link . mouse-face) (mouse-3 . org-find-file-at-mouse) (mouse-2 . org-open-at-mouse))) 62 63 (fontified t org-no-flyspell t mouse-face highlight face org-link keymap (keymap (follow-link . mouse-face) (mouse-3 . org-find-file-at-mouse) (mouse-2 . org-open-at-mouse)) rear-nonsticky (mouse-face highlight keymap invisible intangible help-echo org-linked-text htmlize-link)) 63 64 (fontified t)) :emph-multiline t :for-backend html :skip-before-1st-heading nil :drawers nil :todo-keywords t :tasks t :tags not-in-toc :priority nil :footnotes t :timestamps t :archived-trees headline :select-tags ("export") :exclude-tags ("noexport") :add-text nil :LaTeX-fragments t)
  org-export-as-html(nil)
  call-interactively(org-export-as-html)
  org-export(nil)
  call-interactively(org-export nil nil)
  command-execute(org-export)

If this isn't already known/fixed, should I report it as a bug? And
eventually, on Emacs itself or on org-mode?

thanks in advance,
bye, lele.

[1] GNU Emacs 24.3.50.1 (x86_64-pc-linux-gnu, GTK+ Version 3.4.2) of 2013-03-04 on dex, modified by Debian
-- 
nickname: Lele Gaifax | Quando vivrò di quello che ho pensato ieri
real: Emanuele Gaifas | comincerò ad aver paura di chi mi copia.
lele@metapensiero.it  |                 -- Fortunato Depero, 1929.