FreeNAS

Using the API to update the ssh key for a user, the server throws an exception and returns an error response:

Sorry, this request could not be processed. Please try again later.

data = {
        'bsdusr_sshpubkey': ssh_key,
    }
url = "http://%s/api/v1.0/account/users/%d/" % (fn_host, user_data['bsdusr_uid'])
response = requests.put(url, auth=get_auth(), json=data).json()    

The stacktraces in the log:

Traceback (most recent call last):
  File "/usr/local/lib/python2.7/site-packages/tastypie/resources.py", line 201, in wrapper
    response = callback(request, *args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/tastypie/resources.py", line 441, in dispatch_detail
    return self.dispatch('detail', request, **kwargs)
  File "/usr/local/www/freenasUI/../freenasUI/api/utils.py", line 234, in dispatch
    request_type, request, *args, **kwargs
  File "/usr/local/lib/python2.7/site-packages/tastypie/resources.py", line 464, in dispatch
    response = method(request, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/tastypie/resources.py", line 1437, in put_detail
    updated_bundle = self.obj_create(bundle=bundle, **self.remove_api_resource_names(kwargs))
  File "/usr/local/lib/python2.7/site-packages/tastypie/resources.py", line 2104, in obj_create
    return self.save(bundle)
  File "/usr/local/www/freenasUI/../freenasUI/api/utils.py", line 353, in save
    api_validation=True,
  File "/usr/local/www/freenasUI/../freenasUI/account/forms.py", line 298, in __init__
    self.fields['bsdusr_group'].initial = self.instance.bsdusr_group
  File "/usr/local/lib/python2.7/site-packages/django/db/models/fields/related.py", line 326, in __get__
    "%s has no %s." % (self.field.model.__name__, self.field.name))
DoesNotExist: bsdUsers has no bsdusr_group.

I've tried this with different users, builtin (root), and non-builtin.