Error: 'NoneType' object has no attribute 'strip'

Hello,

I am getting this error: Error: 'NoneType' object has no attribute 'strip'

I have created a model and I am trying to autofill slug field in it. When I save the record in database I get this error: Error: 'NoneType' object has no attribute 'strip'

My model is:

from django.db import models

from autoslug import AutoSlugField

# Create your models here.

class Shop(models.Model):

    name = models.CharField(max_length=200)

    image = models.CharField(max_length=200)

    description = models.TextField()

    slug = models.SlugField(null=True, blank=True)

    slug = AutoSlugField(populate_from='name')

If I remove: slug = AutoSlugField(populate_from='name') then it works fine. So, can someone tell me what is the issue here?

Thanks 

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