On a Moodle 4.37, when compression is active in a Redis cache store and we deactivate it, the platform becomes inaccessible with this error message.

However, when looking at the muc/config.php file, the value is indeed set to 0.

To fix the problem, we need to set the value back to 1 in the muc/config.php file. As a result, we can no longer disable compression.