Having issues with DEV build 138, staging. Error from KSP_Data/output_log.txt (quickly became 13 MB, same error repeating) MechJeb module MechJebModuleStagingController threw an exception in OnUpdate: System.InvalidOperationException: Operation is not valid due to the current state of the object at System.Linq.Enumerable.First[ModuleEnginesFX] (IEnumerable`1 source) [0x00000] in <filename unknown>:0 at MuMech.MechJebModuleStagingController.<FindBurnedResources>m__8F (.Part p) [0x00000] in <filename unknown>:0 at System.Linq.Enumerable+<CreateSelectIterator>c__Iterator10`2[Part,ModuleEnginesFX].MoveNext () [0x00000] in <filename unknown>:0 at System.Linq.Enumerable+<CreateSelectManyIterator>c__Iterator12`2[ModuleEnginesFX,Propellant].MoveNext () [0x00000] in <filename unknown>:0 at System.Linq.Enumerable+<CreateUnionIterator>c__Iterator1C`1[Propellant].MoveNext () [0x00000] in <filename unknown>:0 at System.Linq.Enumerable+<CreateSelectIterator>c__Iterator10`2[Propellant,System.Int32].MoveNext () [0x00000] in <filename unknown>:0 at System.Collections.Generic.List`1[System.Int32].AddEnumerable (IEnumerable`1 enumerable) [0x00000] in <filename unknown>:0 at System.Collections.Generic.List`1[System.Int32]..ctor (IEnumerable`1 collection) [0x00000] in <filename unknown>:0 at System.Linq.Enumerable.ToList[Int32] (IEnumerable`1 source) [0x00000] in <filename unknown>:0 at MuMech.MechJebModuleStagingController.FindBurnedResources () [0x00000] in <filename unknown>:0 at MuMech.MechJebModuleStagingController.OnUpdate () [0x00000] in <filename unknown>:0 at MuMech.MechJebCore.Update () [0x00000] in <filename unknown>:0 (Filename: C:/BuildAgent/work/ea95e74f6e5f192d/Runtime/ExportGenerated/StandalonePlayer/UnityEngineDebug.cpp Line: 54)