Multinode Health Check error

FieldError at /scheduler/labhealth/device/panda19
Cannot resolve keyword 'duration' into field. Choices are: _results_bundle, _results_link, actual_device, definition, description, devicestatetransition, end_time, failure_comment, failure_tags, group, health_check, id, is_public, log_file, priority, requested_device, requested_device_type, start_time, status, sub_id, submit_time, submit_token, submitter, tags, target_group, user
Request Method: GET
Request URL: http://multinode.validation.linaro.org/scheduler/labhealth/device/panda19

Not sure what is happening behind the scenes here but we need working health checks and health check analysis pages before MultiNode can be put into production.