Wow that was a fast fix, thank you!
In some other logs i found another error on a dedicated server (version 1.2.8 ) running on Windows.
Looks like it has something to do with contact from player > player or player > station.
Sometimes it throws a NullReferenceException.
AtomicTorch.SpaceRPG.Server.U
tils.SpaceContactListener.Phy
sicsWorldPostSolve(Contact contact, ContactVelocityConstraint impulse)
and again here are the logs...
Log_VoidExpanse_Server_2015-04-08_15-00.log