Acesso ao admin como usuário anônimo gera erro

[brunosmartin]

http://localhost:8080/admin/courses/1/

Deveria gerar um forbiden (403)

Internal Server Error: /admin/course/1/certificatesettings/
Traceback (most recent call last):
File "/home/bruno/.virtualenvs/timtec-novo/lib/python2.7/site-packages/django/core/handlers/base.py", line 132, in get_response
response = wrapped_callback(request, _callback_args, *_callback_kwargs)
File "/home/bruno/.virtualenvs/timtec-novo/lib/python2.7/site-packages/django/views/generic/base.py", line 71, in view
return self.dispatch(request, _args, *_kwargs)
File "/home/bruno/devel/timtec/administration/views.py", line 78, in dispatch
if not (request.user.is_superuser or self.object.get_professor_role(request.user) == 'coordinator'):
File "/home/bruno/devel/timtec/core/models.py", line 196, in get_professor_role
cp = self.course_professors.get(user=user)
File "/home/bruno/.virtualenvs/timtec-novo/lib/python2.7/site-packages/django/db/models/manager.py", line 127, in manager_method
return getattr(self.get_queryset(), name)(_args, *_kwargs)
File "/home/bruno/.virtualenvs/timtec-novo/lib/python2.7/site-packages/django/db/models/query.py", line 325, in get
clone = self.filter(_args, *_kwargs)
File "/home/bruno/.virtualenvs/timtec-novo/lib/python2.7/site-packages/django/db/models/query.py", line 679, in filter
return self._filter_or_exclude(False, _args, *_kwargs)
File "/home/bruno/.virtualenvs/timtec-novo/lib/python2.7/site-packages/django/db/models/query.py", line 697, in _filter_or_exclude
clone.query.add_q(Q(_args, *_kwargs))
File "/home/bruno/.virtualenvs/timtec-novo/lib/python2.7/site-packages/django/db/models/sql/query.py", line 1310, in add_q
clause, require_inner = self._add_q(where_part, self.used_aliases)
File "/home/bruno/.virtualenvs/timtec-novo/lib/python2.7/site-packages/django/db/models/sql/query.py", line 1338, in _add_q
allow_joins=allow_joins, split_subq=split_subq,
File "/home/bruno/.virtualenvs/timtec-novo/lib/python2.7/site-packages/django/db/models/sql/query.py", line 1200, in build_filter
lookups, value)
File "/home/bruno/.virtualenvs/timtec-novo/lib/python2.7/site-packages/django/db/models/fields/related.py", line 1745, in get_lookup_constraint
lookup_class(target.get_col(alias, source), val), AND)
File "/home/bruno/.virtualenvs/timtec-novo/lib/python2.7/site-packages/django/db/models/lookups.py", line 101, in init
self.rhs = self.get_prep_lookup()
File "/home/bruno/.virtualenvs/timtec-novo/lib/python2.7/site-packages/django/db/models/lookups.py", line 139, in get_prep_lookup
return self.lhs.output_field.get_prep_lookup(self.lookup_name, self.rhs)
File "/home/bruno/.virtualenvs/timtec-novo/lib/python2.7/site-packages/django/db/models/fields/init.py", line 727, in get_prep_lookup
return self.get_prep_value(value)
File "/home/bruno/.virtualenvs/timtec-novo/lib/python2.7/site-packages/django/db/models/fields/init.py", line 985, in get_prep_value
return int(value)
TypeError: int() argument must be a string or a number, not 'SimpleLazyObject'