Issue with 2 ForeignKeys

[POD666]

model:
class Personages(models.Model):
name = models.CharField(max_length=200)
act_born_id = models.ForeignKey('ActsBorn')
act_death_id = models.ForeignKey('ActsDeath', null=True)

faker:
populator = Faker.getPopulator()
populator.addEntity(ActsDeath,30, {
'death_location': lambda x: populator.generator.format('address'),
})
populator.addEntity(ActsBorn,30, {
'name': lambda x: populator.generator.format('name'),
'born_location': lambda x: populator.generator.format('address'),
})
populator.addEntity(Personages,30, {
'name': lambda x: populator.generator.format('name'),
})

insertedPks = populator.execute()

error:
in run insertedPks = populator.execute()
File "/usr/local/lib/python2.7/dist-packages/django_faker/populator.py", line 163, in execute
insertedEntities[klass].append( self.entities[klass].execute(using, insertedEntities) )
File "/usr/local/lib/python2.7/dist-packages/django_faker/populator.py", line 105, in execute
setattr(obj, field, value)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/fields/related.py", line 405, in set
self.field.name, self.field.rel.to._meta.object_name))
ValueError: Cannot assign "<ActsDeath: ActsDeath object>": "Personages.act_born_id" must be a "ActsBorn" instance.