Save model error

[Ihor Maslov]

Hello. I can not solve the problem. When I save data in the model through the admin panel, I get this error:

Environment:

Request Method: POST

Request URL: http://127.0.0.1:8000/ru/admin/portfolio/publication/add/

Django Version: 1.6.2

Python Version: 2.7.5

Installed Applications:

('localeurl',

 'suit',

 'django.contrib.admin',

 'django.contrib.auth',

 'django.contrib.contenttypes',

 'django.contrib.sessions',

 'django.contrib.messages',

 'django.contrib.staticfiles',

 'modeltranslation',

 'ckeditor',

 'portfolio')

Installed Middleware:

('django.contrib.sessions.middleware.SessionMiddleware',

 'localeurl.middleware.LocaleURLMiddleware',

 'django.middleware.common.CommonMiddleware',

 'django.middleware.csrf.CsrfViewMiddleware',

 'django.contrib.auth.middleware.AuthenticationMiddleware',

 'django.contrib.messages.middleware.MessageMiddleware',

 'django.middleware.clickjacking.XFrameOptionsMiddleware')

Traceback:

File "/home/ihor/.virtualenvs/maice/local/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response

  114.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/home/ihor/.virtualenvs/maice/local/lib/python2.7/site-packages/django/contrib/admin/options.py" in wrapper

  432.                 return self.admin_site.admin_view(view)(*args, **kwargs)

File "/home/ihor/.virtualenvs/maice/local/lib/python2.7/site-packages/django/utils/decorators.py" in _wrapped_view

  99.                     response = view_func(request, *args, **kwargs)

File "/home/ihor/.virtualenvs/maice/local/lib/python2.7/site-packages/django/views/decorators/cache.py" in _wrapped_view_func

  52.         response = view_func(request, *args, **kwargs)

File "/home/ihor/.virtualenvs/maice/local/lib/python2.7/site-packages/django/contrib/admin/sites.py" in inner

  198.             return view(request, *args, **kwargs)

File "/home/ihor/.virtualenvs/maice/local/lib/python2.7/site-packages/django/utils/decorators.py" in _wrapper

  29.             return bound_func(*args, **kwargs)

File "/home/ihor/.virtualenvs/maice/local/lib/python2.7/site-packages/django/utils/decorators.py" in _wrapped_view

  99.                     response = view_func(request, *args, **kwargs)

File "/home/ihor/.virtualenvs/maice/local/lib/python2.7/site-packages/django/utils/decorators.py" in bound_func

  25.                 return func(self, *args2, **kwargs2)

File "/home/ihor/.virtualenvs/maice/local/lib/python2.7/site-packages/django/db/transaction.py" in inner

  339.                 return func(*args, **kwargs)

File "/home/ihor/.virtualenvs/maice/local/lib/python2.7/site-packages/django/contrib/admin/options.py" in add_view

  1113.             if form.is_valid():

File "/home/ihor/.virtualenvs/maice/local/lib/python2.7/site-packages/django/forms/forms.py" in is_valid

  129.         return self.is_bound and not bool(self.errors)

File "/home/ihor/.virtualenvs/maice/local/lib/python2.7/site-packages/django/forms/forms.py" in errors

  121.             self.full_clean()

File "/home/ihor/.virtualenvs/maice/local/lib/python2.7/site-packages/django/forms/forms.py" in full_clean

  275.         self._post_clean()

File "/home/ihor/.virtualenvs/maice/local/lib/python2.7/site-packages/django/forms/models.py" in _post_clean

  413.                 validate_unique=False)

File "/home/ihor/.virtualenvs/maice/local/lib/python2.7/site-packages/django/db/models/base.py" in full_clean

  928.             self.clean_fields(exclude=exclude)

File "/home/ihor/.virtualenvs/maice/local/lib/python2.7/site-packages/modeltranslation/translator.py" in new_clean_fields

  190.             for field_name, value in self._mt_form_pending_clear.items():

Exception Type: AttributeError at /admin/portfolio/publication/add/

Exception Value: 'NoneType' object has no attribute 'items'

can someone help?