Object reference not set to an instance of an object when calculating interpolations

[Lothsahn]

"System.NullReferenceException: Object reference not set to an instance of an object
at LunaClient.Systems.VesselUpdateSys.VesselUpdate.GetInterpolatedAcceleration (Single interpolationValue) [0x00020] in C:\shared\kerbal space program\LunaMultiPlayer\Client\Systems\VesselUpdateSys\VesselUpdate.cs:449
at LunaClient.Systems.VesselUpdateSys.VesselUpdate.ApplySurfaceInterpolation (Single interpolationValue) [0x00001] in C:\shared\kerbal space program\LunaMultiPlayer\Client\Systems\VesselUpdateSys\VesselUpdate.cs:398
at LunaClient.Systems.VesselUpdateSys.VesselUpdate.ApplyInterpolations (Single percentage) [0x00033] in C:\shared\kerbal space program\LunaMultiPlayer\Client\Systems\VesselUpdateSys\VesselUpdate.cs:353 "

Breakpointing on VesselUpdate:449, I found that the Target.Acceleration was null, but the Target was valid. I'm not sure what the conditions are for a target to have or not have an acceleration.

[Lothsahn]

This occurs when we are targeting an entity which provides an Orbital update. Orbital updates do not set acceleration, but instead set Orbit (see VesselUpdateMessageHandler.cs), which means that you get a NullReference exception inside VesselUpdate when it attempts to apply a surface interpolation but the target is providing orbital coordinates.

This explains why Target.Acceleration is null. Target.Orbit does contain information, but Target.Acceleration does not.

[gavazquez]

Being worked on. closing the bug until vessel updater is finished