bug bulk_create

Traceback (most recent call last):
  File "/usr/lib/python3.7/code.py", line 90, in runcode
    exec(code, self.locals)
  File "<console>", line 1, in <module>
  File "/home/nima/.virtualenvs/behtarino/lib/python3.7/site-packages/django/db/models/fields/related_descriptors.py", line 946, in add
    through_defaults=through_defaults,
  File "/home/nima/.virtualenvs/behtarino/lib/python3.7/site-packages/django/db/models/fields/related_descriptors.py", line 1150, in _add_items
    ])
TypeError: bulk_create() got an unexpected keyword argument 'ignore_conflicts'

hi i have three models

when i try to add on deal to one a category 

like : deal.categories.add(category)

i face error above can you help me about what the problem is ?

class Deal(ModificationLogMixin, models.Model):
    title = models.CharField(max_length=160, blank=True, null=True)
    description = models.TextField(blank=True, null=True)
    initial_price = models.IntegerField(blank=True)
    discounted_price = models.IntegerField(blank=True)
    categories = models.ManyToManyField(
        'deal.DealCategory',
        related_name='deals',
        blank=True,
        through='DealCategoryThrough',
        through_fields=('deal', 'dealcategory')
    )

class DealCategory(OrderedModel):
    business = models.ForeignKey(Business, related_name='deal_categories',
                                 on_delete=deletion.CASCADE)
    name = models.CharField(max_length=100, blank=True, null=True)
    order_with_respect_to = 'business'

class DealCategoryThrough(OrderedModel):
    deal = models.ForeignKey('deal.Deal', on_delete=models.deletion.CASCADE,
                             related_name='ordered_deals')
    dealcategory = models.ForeignKey(DealCategory, on_delete=models.deletion.CASCADE,
                                     related_name='ordered_deals')
    order_with_respect_to = 'dealcategory'

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