[Python] You are trying to add a non-nullable field 'new_field' to userprofile without a...

I know that from Django 1.7 I don't need to use South or any other migration system, so I am just using simple command python manage.py makemigrations

However, all I get is this error:

You are trying to add a non-nullable field 'new_field' to userprofile without a default;
we can't do that (the database needs something to populate existing rows).


Here is models.py:

class UserProfile(models.Model):
user = models.OneToOneField(User)
website = models.URLField(blank=True)
new_field = models.CharField(max_length=140)


What are options?

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