Attempting to login to cla-assistant.io displays only "Internal Server Error"

[KhronosWebservices]

URL to the linked Repository or Organization

https://github.com/KhronosGroup

Steps to reproduce the problem

1. Visit cla-assistant.io
2. Click on "Sign in with GitHub"
3. Taken to a blank page with only "Internal Server Error"

What is the expected result?

We should have been taken to a page with a listing of our repositories setup in CLA-Assistant

Used browser and browser version?

Tested on Safari, and Firefox. Seems server side related.

Other info

• Using a different account which also has ownership of the KhronosGroup Organization, we can successfully login to cla-assistant.
• We have at least one user so far that is unable to sign for their pull request getting the following error. We have 115 signed CLAs on this repo so far, so this seems a bit odd to stop working like this. We haven't changed our gist. Perhaps related to the above issue?

Error
There is no CLA to sign for KhronosGroup/OpenCL-CTS
(Bad credentials)

Do we need to reset something, perhaps our Org's primary owner account and cla-assistant have become unattached? From issue #378 there was a comment it might be the account hitting a Github API rate limit?