fix: crash from  setting the source from username (#347)
fix: crash from  setting the source from username (#347)


SignalK/signalk-server-node,webmasterkai/signalk-server-node,sbender9/signalk-server-node,webmasterkai/signalk-server-node,SignalK/signalk-server-node,webmasterkai/signalk-server-node,sbender9/signalk-server-node,SignalK/signalk-server-node,SignalK/signalk-server-node,sbender9/signalk-server-node