Context is not passed when creating a new server via OpenStack API

when creating a server via the OpenStack API I am getting :

WARNING:root:Caught error: die
DEBUG:root:Traceback (most recent call last):
  File "/home/chmouel/nova/code/trunk/nova/api/openstack/__init__.py", line 62, in __call__
    return req.get_response(self.application)
  File "/usr/local/lib/python2.6/dist-packages/webob/request.py", line 937, in get_response
    application, catch_exc_info=False)
  File "/usr/local/lib/python2.6/dist-packages/webob/request.py", line 906, in call_application
    app_iter = application(self.environ, start_response)
  File "/usr/local/lib/python2.6/dist-packages/webob/dec.py", line 159, in __call__
    return resp(environ, start_response)
  File "/usr/local/lib/python2.6/dist-packages/webob/dec.py", line 159, in __call__
    return resp(environ, start_response)
  File "/usr/local/lib/python2.6/dist-packages/webob/dec.py", line 159, in __call__
    return resp(environ, start_response)
  File "/usr/lib/pymodules/python2.6/routes/middleware.py", line 131, in __call__
    response = self.app(environ, start_response)
  File "/usr/local/lib/python2.6/dist-packages/webob/dec.py", line 159, in __call__
    return resp(environ, start_response)
  File "/usr/local/lib/python2.6/dist-packages/webob/dec.py", line 147, in __call__
    resp = self.call_func(req, *args, **self.kwargs)
  File "/usr/local/lib/python2.6/dist-packages/webob/dec.py", line 208, in call_func
    return self.func(req, *args, **kwargs)
  File "/home/chmouel/nova/code/trunk/nova/wsgi.py", line 234, in __call__
    result = method(**arg_dict)
  File "/home/chmouel/nova/code/trunk/nova/api/openstack/servers.py", line 138, in create
    key_pair = self.db_driver.key_pair_get_all_by_user(None, user_id)[0]
  File "/home/chmouel/nova/code/trunk/nova/db/api.py", line 362, in key_pair_get_all_by_user
    return IMPL.key_pair_get_all_by_user(context, user_id)
  File "/home/chmouel/nova/code/trunk/nova/db/sqlalchemy/api.py", line 106, in wrapper
    if not is_admin_context(args[0]) and not is_user_context(args[0]):
  File "/home/chmouel/nova/code/trunk/nova/db/sqlalchemy/api.py", line 46, in is_admin_context
    raise Exception('die')
Exception: die

is_admin_context code :

def is_admin_context(context):
    """Indicates if the request context is an administrator."""
    if not context:
        warnings.warn('Use of empty request context is deprecated',
                      DeprecationWarning)
        raise Exception('die')
    return context.is_admin