I was finally able to replicate the error occuring on your site on my test site. I just pushed an updated beta version, 2.1-beta2.
Repeat the process from my previous reply to update to that version. This also corrects the update loop. It was a simple typo on my part, I did not bump the internal version version so it would report that an update was available even though it was already installed.
Hope this helps, please let me know.