Deprecated function: strlen(): Passing null to parameter #1 ($string) of type string is deprecated

Error seen in the watchdog. It seems to me that in some circunstance, a null value is not being checked:

Deprecated function: strlen(): Passing null to parameter #1 ($string) of type string is deprecated en Drupal\vlsuite_utility_classes\VLSuiteUtilityClassesHelper->getUtilitiesApplyToListFormElementSubmit() (línea 374 de /var/www/vhosts/examplim.org/examplim-artifact/web/modules/contrib/vlsuite/modules/vlsuite_utility_classes/src/VLSuiteUtilityClassesHelper.php)