GitLab Version Checker 404

In the top right of the components panel on the Admin screen of the GitLab web interface, there should be an indication to whether or not our GitLab version is current.

But ours shows a broken link image, and when I copy and paste the image URL into another browser page, it gives a 404 and reports "No webpage was found for the web address:… "

Does anyone know why this is, and how to fix it?