Produits Entr'ouvert » Combo

Présentement sur https://portail-demo.dev.entrouvert.org/ j'ai une cellule "Plop" en page d'accueil qui affiche juste "Rubrique" et un bouton "Modifier" et quand je clique sur le bouton j'ai cette trace :

Traceback:
File "/usr/lib/python2.7/dist-packages/django/core/handlers/base.py" in get_response
  132.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/usr/lib/python2.7/dist-packages/django/contrib/auth/decorators.py" in _wrapped_view
  22.                 return view_func(request, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/django/views/generic/base.py" in view
  71.             return self.dispatch(request, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/django/views/generic/base.py" in dispatch
  89.         return handler(request, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/django/views/generic/edit.py" in post
  215.             return self.form_valid(form)
File "/usr/lib/python2.7/dist-packages/combo/apps/newsletters/views.py" in form_valid
  31.             form.save()
File "/usr/lib/python2.7/dist-packages/combo/apps/newsletters/forms.py" in save
  78.         self.instance.set_subscriptions(subscriptions, **self.params)
File "/usr/lib/python2.7/dist-packages/combo/apps/newsletters/models.py" in set_subscriptions
  151.             if not response.json()['data']:
File "/usr/lib/python2.7/dist-packages/requests/models.py" in json
  793.         return json.loads(self.text, **kwargs)
File "/usr/lib/python2.7/json/__init__.py" in loads
  338.         return _default_decoder.decode(s)
File "/usr/lib/python2.7/json/decoder.py" in decode
  366.         obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/lib/python2.7/json/decoder.py" in raw_decode
  384.             raise ValueError("No JSON object could be decoded")