On multiple websites with Themler theme`s i get this error. Can anyone help me with this?

Error details

An error of type E_ERROR was caused on line number 558 of the file functions php. Error message: Uncaught Error: Undefined constant "THEME_TAG_TOKEN" in functions php:558

WordPress version 6.1.1
PHP version 8.1.13

On multiple websites with Themler theme`s i get this error. Can anyone help me with this? Error details =========== An error of type E_ERROR was caused on line number 558 of the file functions php. Error message: Uncaught Error: Undefined constant "THEME_TAG_TOKEN" in functions php:558 WordPress version 6.1.1 PHP version 8.1.13