delete OnetoOneField link

class Cashbox(models.Model):
    cashier = models.OneToOneField('User', null=True, blank=True, related_name='cashbox', on_delete=models.SET_NULL)

in other code:

User.object.get(pk=1)
user.cashbox = None

AttributeError: 'NoneType' object has no attribute 'cashier_id'

one version solving is:

c1 = Cashbox.objects.get(pk=user.cashbox.id)
c1.cashier = None
c1.save()


c2 = Cashbox.object.get(pk=10)
c2.cashier = user
c2.save()

i need get other Cashbox to set link None. Why i need do so. is there a better solution.

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