[3.0]: Error while adding holidays

[Oldiesmann]

Basic Information

Trying to add a holiday results in a PHP error

Steps to reproduce

1. Go to Admin -> Forum -> Calendar -> Manage Holidays and try to add a new holiday

Expected result

Holiday is added

Actual result

Blank screen due to PHP error

Version/Git revision

68b6c73

Database Engine

All

Database Version

10.11.8-MariaDB-ubu2204

PHP Version

8.3.7

Logs

AH01071: Got error 'PHP message: PHP Fatal error: Uncaught Error: Typed property SMF\\Calendar\\Event::$id must not be accessed before initialization in /.../Sources/Calendar/Holiday.php:66

Additional Information

No response