Thanks for looking into it. The problem was most likely an incompatibility
between emacs 24.5.1 and org 9.2.6. I upgraded emacs and it went away.

On Wed, Feb 5, 2020 at 2:13 AM Bastien <bzg@gnu.org> wrote:

> Hi Ian,
>
> > Running org-map-entries on an org file with tags results in an infinite
> > loop.
>
> FWIW, I cannot reproduce this.
>
> > Example function using org-map-entries:
> >
> >     (defun org-map-entries-test ()
> >       (interactive)
> >       (org-map-entries '(lambda () (message "%s" (org-entry-properties
> > (point) 'standard))))
> >       (message "done"))
> >
> > Example org file:
> >
> >     * one
> >     * two
> >     * three
> >  :noexport:
>
> The above exemple is not a valid org file, the tag should be on the
> same line than the headline... but perhaps that's just because your
> email was sent as HTML.
>
> Thanks,
>
> --
>  Bastien
>