I've just successfully upgraded three Moodle sites to version 3.8.
However, the fourth and final site found a problem and the first thing I see when loading the site to initiate the upgrade is an error 'Exception - is not a valid hex color'
I was able to easily roll back to version 3.7.x
This particular site uses the Adaptable theme. This is also used on one of the sites that was successfully upgraded.
I'm stuck with the best way to triage this error.
Any advice gratefully received.