Found out why I got this error. I forgot to return a value for the
validated field. Because this field was prohibited of being NULL, I
got an error.
I achieved what I wanted with the following code:
if self.initial['email'] != self.cleaned_data['email']:
try:
user =
User.objects.get(email__exact=self.cleaned_data['email'])
except User.DoesNotExist:
return self.cleaned_data['email']
raise forms.ValidationError('Dit e-mail adres is al in
gebruik. Kiest \
u alstublieft een andere.')
else:
return self.cleaned_data['email']
Many thanks for those above this post who helped me.
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