In my local repo, I pulled a branch I'd previously pushed to github. After working in that branch, I tried to do git cl status to see the status of my gerrit branches. This caused the output:

Branches associated with reviews:
Credentials for the following hosts are required:
  -review
  

which didn't make much sense. Once I deleted the entry:

[branch "xfa_scripts"]
  remote = github
  merge = refs/heads/xfa_scripts


from my .git/config the git cl tools started working again.

It would be nice to be able to pull branches from a github repo while still being able to work with gerrit.