[O] Bug: org-mode - "Wrong type argument: number-or-marker-p, nil" [9.1.14 (9.1.14-1-g4931fc-elpaplus @ /home/emilio/.emacs.d/elpa/org-plus-contrib-20180910/)]

[Emilio Francesquini]

Remember to cover the basics, that is, what you expected to happen and
what in fact did happen.  You don't know how to make a good report?  See

     https://orgmode.org/manual/Feedback.html#Feedback

Your bug report will be posted to the Org mailing list.
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Consider the following snippet of org

  - First item. I'm just writing something longer so that the minimum
    number of characters is reached.

Anywhere on the second line, calls to org-list-struct fail with the
error: "Wrong type argument: number-or-marker-p, nil".

The following numerical comparison fails in org-list-struct because itm-lst-s 
is nil:

          (when (<= ind (nth 1 (car itm-lst-2)))
                (push (cons ind (point)) end-lst-2))

I stumbled upon this because it essentially renders package
guess-language unsusable in most of my org files. Related bug: 
https://github.com/tmalsburg/guess-language.el/issues/20

Emacs  : GNU Emacs 26.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.30)
 of 2018-09-11
Package: Org mode version 9.1.14 (9.1.14-1-g4931fc-elpaplus @ 
/home/emilio/.emacs.d/elpa/org-plus-contrib-20180910/)