`Class name must be a valid object or a string` error on activity log page

[Boy132]

When enabling Hide admin activies? the following error is thrown when viewing activity logs:

https://github.com/pelican-dev/panel/blob/main/app/Http/Controllers/Api/Client/Servers/ActivityLogController.php#L36

production.ERROR: Class name must be a valid object or a string {"userId":1,"exception":"[object] (Error(code: 0): Class name must be a valid object or a string at /var/www/pelican/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Concerns/HasRelationships.php:793)
[stacktrace]
#0 /var/www/pelican/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Concerns/HasRelationships.php(588): Illuminate\\Database\\Eloquent\\Model->newRelatedInstance()
#1 /var/www/pelican/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Concerns/HasRelationships.php(658): Illuminate\\Database\\Eloquent\\Model->morphToMany()
#2 /var/www/pelican/vendor/spatie/laravel-permission/src/Models/Role.php(82): Illuminate\\Database\\Eloquent\\Model->morphedByMany()
#3 /var/www/pelican/app/Http/Controllers/Api/Client/Servers/ActivityLogController.php(36): Spatie\\Permission\\Models\\Role->users()

When running the same method in tinker console no error is thrown: