[Bug] mb_strtolower(): Argument #1 ($string) must be of type string, array given in Referrers/Columns/Base.php:58

[tsteur]

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.

[sgiehl]

@tsteur Are we by any chance able to look up the tracking url causing this error? It seems like for any reason the referrer name is set to an array instead of a string. But it's hard to determine where that comes from.