The delete method of Versionable raises an error

[gabn88]

This is how I imported cleanerversion:

class CustomerQuerySet(VersionedQuerySet):
    def my_custom_filter(self, something):
        pass

class CustomerManager(VersionManager):
    def get_queryset(self):
        return CustomerQuerySet(self.model, using=self._db)

    def my_custom_filter(self):
        return self.get_queryset().my_custom_filter()
 
@python_2_unicode_compatible       
class Customer(Versionable, AbstractAddress):

This is where it goes wrong on VersionManager (I set a trace to find it):

    def delete(self, using=None):
        using = using or router.db_for_write(self.__class__, instance=self)
        assert self._get_pk_val() is not None, \
            "{} object can't be deleted because its {} attribute is set to None.".format(
                self._meta.object_name, self._meta.pk.attname)

        collector_class = get_versioned_delete_collector_class()
        collector = collector_class(using=using)
        collector.collect([self])
        collector.delete(get_utc_now())

on collector.collect([self]) an error is raised:
AttributeError: 'Manager' object has no attribute 'current'