Model Update ignores null

@AngelRodriguez
iRedds's code works. I don't know why you can't update.

Problem solved:

My "Customer Entity" was:

PHP Code:

class Customer extends Entity
{
    protected $attributes = [
        'customer_id' => null,
        'customer_deleted' => null,
        'customer_deleted_at' => null,
    ];

    protected $dates = ['customer_deleted_at'];
} 


Removing " => null", works:

PHP Code:

class Customer extends Entity
{
    protected $attributes = [
        'customer_id',
        'customer_deleted',
        'customer_deleted_at',
    ];

    protected $dates = ['customer_deleted_at'];
}

Thank you.