We are self-hosted and in the process of updating our test installation from version 4.6.12.1 to 4.7.1
When updating the underlying systems we have started to encounter an error. Prior to updating the forum software we updated the server to: Debian 10 Buster, installed PHP 8.2. There was a MySQL update in there also. It's now running 10.3.34-MariaDB-0+deb10u1 Debian 10
Since this backend update when attempting to access the forums, we are encountering an error 500 on the UI, the only capturable error log is: PHP Fatal error: Declaration of IPS\\Login_Playnet::usernameIsInUse($username) must be compatible with IPS\\Login_Handler::usernameIsInUse($username, ?IPSMember $exclude = null) in var/www/forums/system/Login/Playnet.php on line 320
This error shows up when attempting to either a) login, or b) change theme from default. As a result, the /admin area is not accessible to look into other possible causes or remediate.