Adds field name to NPE
Adds field name to NPE

openzipkin/zipkin,twitter/zipkin,adriancole/zipkin,twitter/zipkin,twitter/zipkin,openzipkin/zipkin,openzipkin/zipkin,adriancole/zipkin,adriancole/zipkin,openzipkin/zipkin,adriancole/zipkin,openzipkin/zipkin,twitter/zipkin