Passing null to parameter #1 is deprecated

[sunscreem]

Describe the bug
Just installed the package in a laravel 11 app and thought I'd try it out in Tinker.

 UserPreferences::set('test','test2')

   DEPRECATED  json_decode(): Passing null to parameter #1 ($json) of type string is deprecated in vendor/robtrehy/laravel-user-preferences/src/UserPreferences.php on line 79.

= null

All working great I just get that deprecation warning.

To Reproduce
Steps to reproduce the behavior:

1. Go to Tinker
2. Login as a user
3. Run UserPreferences::set('test','test2')