Using Joomla 4.2.3 / Gantry5 5.5.15 / Template Solo v1.7.0 it_solo and PHP 8.1 reports error message:
Deprecated: htmlspecialchars(): Passing null to parameter #1 ($string) of type string is deprecated in ..../www/team/templates/it_solo/html/layouts/chromes/gantry.php on line 31
No error message using PHP 8.0!