[Orgmode] [BUG] org-export-normalize-links: Invalid function: org-if-unprotected-at

[Eric Schulte]

Hi,

When publishing large html projects I sometimes run into the following
error.

: org-export-normalize-links: Invalid function: org-if-unprotected-at

This happens unpredictably, and I find that it can normally be fixed by
some combination of...
- updating Org-mode with git pull
- running make clean && make in my Org-mode directory
- restarting Emacs

My questions are
- has anyone else seen this?
- does anyone have advice for forensic analysis I should perform next
  time this happens?

Thanks -- Eric