Exception after Update to 5.3.25 // Image Processing

[at-ac]

After Update t3sbootstrap from 5.3.24 to 5.3.25 I get the error message:
"PHP Runtime Deprecation Notice: Creation of dynamic property T3SBS\T3sbootstrap\DataProcessing\GalleryProcessor::$minimumWidthIfEmpty is deprecated in /var/customers/webs/user33/site-v12/typo3conf/ext/t3sbootstrap/Classes/DataProcessing/GalleryProcessor.php line 161"

Adding
91: protected $minimumWidthIfEmpty;
in GalleryProcessor.php works for me.

TYPO3 13.4.18
PHP 8.3.23

Thanks!