edit: see the answer below by p4nix. My answer is wrong. The problem is caused by using the old version from here whereas glutanimate’s official version from github is much younger
original answer:
this problem is caused by the add-on “Review Heatmap”.
The add-on creator won’t be notified about this thread. There’s Review Heatmap [Official Support Thread] and https://github.com/glutanimate/review-heatmap/issues
I would check both if other users have reported the same problem and if there’s a solution. If not I would repost there and offers as much info as possible.