ofxKinectForWindows2 HEAD joint getOrientation

I want to get the orientation of the head joint but is allways returning 0 however if i use neck joint orientation works.

Someone knows why?

ofQuaternion orNeck = body.joints[JointType_Neck].getOrientation(); // works
ofQuaternion orHead = body.joints[JointType_Head].getOrientation(); // 0 value

Elliot woods reply me on github, thats why its 0 value