Negative earnings after ~24 hours
I know, I had a similar issue before: #542
But in this case, it almost run for 1 day. Can't be my earning during this time negative.

![image](https://user-images.githubusercontent.com/1230402/39553346-84033f84-4e6d-11e8-9381-16c95799ebb6.png)

On the pool:
![image](https://user-images.githubusercontent.com/1230402/39553276-126623f0-4e6d-11e8-9532-5caee6152cef.png)