Hello,
Matt Price <moptop99@gmail.com> writes:
> What's going on here? Can anyone else reproduce this? I'm seeing it on org
> 9.0.3 up to date as of today, emacs git from 2017-01-04.
You mark a region then jump around the buffer with `org-map-entries'. At
some point the region contains no headline, but you request a subtree
export, hence the error.