Exception with queued tracking - I suspect the queuedTracking Plugin to be the reason for the Exception:

Uncaught exception in /home/users/xxx/www/stats/core/DeviceDetector/DeviceDetectorFactory.php line 28:
Piwik\DeviceDetector\DeviceDetectorFactory::makeInstance(): Argument #2 ($clientHints) must be of type array, null given, called in /home/users/xxx/www/stats/core/Tracker/VisitExcluded.php on line 193

When updated from an older version, requests of an "older format" may have been still present in the queue and could not be processed further.

Expected Behavior

Piwik/Request getClientHints() should return an empty array, if no data was found, not null, because for DeviceDetectorFactory::makeInstance(), $clientHints has to be an array.

Current Behavior

Exception is thrown, Queue handling stops.

Possible Solution

Steps to Reproduce (for Bugs)

Context

Your Environment

• Matomo Version: 4.12 (updated from 4.5)
• PHP Version: 8
• Server Operating System: Debian
• Additionally installed plugins:

• Browser:
• Operating System: