Dashboard display NaN for Pool and Utilization

Dashboard looks like the following:

<img width="1278" alt="screenshot 2016-01-17 16 20 21" src="https://cloud.githubusercontent.com/assets/99423/12377663/422f2c28-bd36-11e5-8a5e-6947173d6e08.png">

As far I can see, it trying to get pool size from /workers data (worker[i].config.gevent) but I see no .gevent here, only 'greenlets: 8'. May it be a typo?
