>        def clean_username(self):
>                data = self.cleaned_data['username']
>                try:
>                        User.objects.get(username=data)
>                except User.DoesNotExist:
>                        return
>                raise forms.ValidationError('The username "%s" is already 
> taken.' %
> data)


The django docs [1] say that for the clean_<fieldname> method, "Just
like the general field clean() method, above, this method should
return the cleaned data, regardless of whether it changed anything or
not."

Since you're returning nothing, self.cleaned_data['username'] will be
None when saving your user hence the "auth_user.username may not be
NULL" exception.


[1] http://docs.djangoproject.com/en/dev/ref/forms/validation/

hth,
Nuno

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