WARNING: …/matomo/plugins/SecurityInfo/PhpSecInfo/Test/Test.php(571): Notice - Trying to access array offset on value of type bool - Matomo 4.1.1 - Please report this message in the Matomo forums: (please do a search first as it might have been reported already) (Module: SecurityInfo, Action: index, In CLI mode: false)


The issue has been solved in

but this will only be included in Matomo 4.2.

But will also fix the issue, so you can either apply this change or wait until a new version of the plugin is published (which should have happened just now)