The Async JavaScript plugin was causing the problem.
Thanks, Ray. That’s exactly what we did yesterday. The update process worked as expected.
Clicking the update banner was problematic.
The banner did disappear when we completed the more “manual” update.
Again, thanks for your help.
We updated using cbox-theme-master.zip from GitHub, but the error does not go away.
We’re using PHP 7.215 for Ubuntu 18.04.1, if that matters.
