«slug is defined before trying to ensure uniqueness» exception for Cyrillic populate source for Python 3.5.x

Hi. Let's say we have a model:

@python_2_unicode_compatible
class News(models.Model):
    title = models.CharField(verbose_name=_('заголовок'), max_length=128, unique=True)
    slug = AutoSlugField(populate_from='title')
    ...

So, if I try to add news with latin chars from django-admin page (for example: title = 'Hello!'), it's work fine. But, if I try do the same with cyrillic (title='Привет!'), I get exception «slug is defined before trying to ensure uniqueness»

Django 1.8 Python 3.5.0

How can I fix it?

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