What happened?

This is on PHP 8.2

Happens few times per day.

Backtrace:

PHP Fatal error: Uncaught TypeError: mb_strtolower(): Argument #1 ($string) must be of type string, array given in /var/www/html/plugins/Referrers/Columns/Base.php:589 Stack trace: #0 /var/www/html/plugins/Referrers/Columns/Base.php(589): mb_strtolower() #1 /var/www/html/plugins/Referrers/Columns/Base.php(123): Piwik\Plugins\Referrers\Columns\Base->detectReferrerCampaign() #2 /var/www/html/plugins/Referrers/Columns/Base.php(269): Piwik\Plugins\Referrers\Columns\Base->getReferrerInformation() #3 /var/www/html/plugins/Referrers/Columns/Campaign.php(43): Piwik\Plugins\Referrers\Columns\Base->getReferrerInformationFromRequest() #4 /var/www/html/core/Tracker/Visit.php(545): Piwik\Plugins\Referrers\Columns\Campaign->shouldForceNewVisit() #5 /var/www/html/core/Tracker/Visit.php(173): Piwik\Tracker\Visit->triggerPredicateHookOnDimensions() #6 /var/www/html/core/Tracker.php(171): Piwik\Tracker\Visit->handle() #7 /var/www/html/core/Tracker/Handler.php(55): Piwik\Tracker->trackRequest() #8 /var/www/html/core/Tracker.php(151): Piwik\Tracker\Handler->process() #9 /var/www/html/core/Tracker.php(126): Piwik\Tracker->track() #10 /var/www/html/piwik.php(73): Piwik\Tracker->main() #11 {main} thrown in /var/www/html/plugins/Referrers/Columns/Base.php on line 589

What should happen?

No fatal error

How can this be reproduced?

.

Matomo version

5

PHP version

No response

Server operating system

No response

What browsers are you seeing the problem on?

No response

Computer operating system

No response

Relevant log output

No response

Validations

• Read our Contributing Guidelines.
• Follow our Security Policy.
• Check that there isn't already an issue that reports the same bug to avoid creating duplicates.
• The provided steps to reproduce is a minimal reproducible of the Bug.