>=php 8.3 - decrement on type null

[2024-01-12 15:21:53] (ERROR @ /var/www/html/testsite/core/components/pdotools/src/CoreTools.php : 1068) PHP warning: Decrement on type null has no effect, this will change in the next major version of PHP

It's just a warning yet. The warning is written to the logs when using PHP 8.3.