Events: "Opslaan en opnieuw bewerken" gaat stuk

Dit is al de tweede keer dat ik een event volledig invul en alles kwijt ben, omdat ik mijn werk op wil slaan. [frustration intensifies] Hoewel er bij staat dat jullie er nu van op de hoogte zijn, zou ik dit graag ook in een issue hebben, zodat ik weet wanneer het is opgelost.

Alvast bedankt!

Traceback: 

File "/usr/local/lib/python3.5/site-packages/django/core/handlers/exception.py" in inner 
39. response = get_response(request) 

File "/usr/local/lib/python3.5/site-packages/django/core/handlers/base.py" in _get_response 
187. response = self.process_exception_by_middleware(e, request) 

File "/usr/local/lib/python3.5/site-packages/django/core/handlers/base.py" in _get_response 
185. response = wrapped_callback(request, *callback_args, **callback_kwargs) 

File "/usr/local/lib/python3.5/site-packages/django/contrib/admin/options.py" in wrapper 
544. return self.admin_site.admin_view(view)(*args, **kwargs) 

File "/usr/local/lib/python3.5/site-packages/django/utils/decorators.py" in _wrapped_view 
149. response = view_func(request, *args, **kwargs) 

File "/usr/local/lib/python3.5/site-packages/django/views/decorators/cache.py" in _wrapped_view_func 
57. response = view_func(request, *args, **kwargs) 

File "/usr/local/lib/python3.5/site-packages/django/contrib/admin/sites.py" in inner 
211. return view(request, *args, **kwargs) 

File "/usr/local/lib/python3.5/site-packages/django/contrib/admin/options.py" in add_view 
1509. return self.changeform_view(request, None, form_url, extra_context) 

File "/usr/local/lib/python3.5/site-packages/django/utils/decorators.py" in _wrapper 
67. return bound_func(*args, **kwargs) 

File "/usr/local/lib/python3.5/site-packages/django/utils/decorators.py" in _wrapped_view 
149. response = view_func(request, *args, **kwargs) 

File "/usr/local/lib/python3.5/site-packages/django/utils/decorators.py" in bound_func 
63. return func.__get__(self, type(self))(*args2, **kwargs2) 

File "/usr/local/lib/python3.5/contextlib.py" in inner 
30. return func(*args, **kwds) 

File "/usr/local/lib/python3.5/site-packages/django/contrib/admin/options.py" in changeform_view 
1441. if form.is_valid(): 

File "/usr/local/lib/python3.5/site-packages/django/forms/forms.py" in is_valid 
169. return self.is_bound and not self.errors 

File "/usr/local/lib/python3.5/site-packages/django/forms/forms.py" in errors 
161. self.full_clean() 

File "/usr/local/lib/python3.5/site-packages/django/forms/forms.py" in full_clean 
370. self._clean_fields() 

File "/usr/local/lib/python3.5/site-packages/django/forms/forms.py" in _clean_fields 
388. value = field.clean(value) 

File "/usr/local/lib/python3.5/site-packages/django/forms/fields.py" in clean 
158. value = self.to_python(value) 

File "/usr/local/lib/python3.5/site-packages/django/forms/models.py" in to_python 
1220. value = self.queryset.get(**{key: value}) 

File "/usr/local/lib/python3.5/site-packages/django/db/models/query.py" in get 
389. (self.model._meta.object_name, num) 

Exception Type: MultipleObjectsReturned at /admin/events/event/add/ 
Exception Value: get() returned more than one Committee -- it returned 2! 
Request information: 
USER: fgerlings