Good lord please forgive me for the endless wall of text but here's what I think is the section of the log where things go bad
------------------- initializing flight mode... ------------------
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
Target vessel index: 54 vessel count: 59
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
[FLIGHT GLOBALS]: Switching To Vessel Sanctuary Minmus ----------------------
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
setting new dominant body: Minmus
FlightGlobals.mainBody: Minmus
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
Reference Frame: Rotating
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
HighlightingSystem : Multiple Highlighter components on a single GameObject is not allowed! Highlighter has been disabled on a GameObject with name 'model'.
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
[Part]: PartModule TransferDialogSpawner at crewCabin, index 4: index exceeds module count as defined in cfg.
Looking for TransferDialogSpawner in other indices...
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
...no TransferDialogSpawner module found on part definition. Skipping...
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
PartModule is null.
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
[Part]: PartModule TransferDialogSpawner at cupola, index 6: index exceeds module count as defined in cfg.
Looking for TransferDialogSpawner in other indices...
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
...no TransferDialogSpawner module found on part definition. Skipping...
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
PartModule is null.
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
[Part]: PartModule TransferDialogSpawner at mk2LanderCabin, index 6: index exceeds module count as defined in cfg.
Looking for TransferDialogSpawner in other indices...
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
...no TransferDialogSpawner module found on part definition. Skipping...
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
PartModule is null.
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
Camera Mode: AUTO
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
stage manager resuming...
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
all systems started
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
WheelCollider requires an attached Rigidbody to function.
(Filename: Line: 167)
WheelCollider requires an attached Rigidbody to function.
(Filename: Line: 167)
WheelCollider requires an attached Rigidbody to function.
(Filename: Line: 167)
WheelCollider requires an attached Rigidbody to function.
(Filename: Line: 167)
WheelCollider requires an attached Rigidbody to function.
(Filename: Line: 167)
WheelCollider requires an attached Rigidbody to function.
(Filename: Line: 167)
WheelCollider requires an attached Rigidbody to function.
(Filename: Line: 167)
WheelCollider requires an attached Rigidbody to function.
(Filename: Line: 167)
Reloaded override drag cube for zeroed cube root part largeAdapter2 (Sanctuary Minmus) on vessel Sanctuary Minmus
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
KerbalEngineer -> ActionMenu was created.
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
KerbalEngineer -> ActionMenu->Awake
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
KerbalEngineer -> FlightEngineerCore->Awake
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
KerbalEngineer -> ActionMenuGui was created.
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
KerbalEngineer -> ActionMenu->Start
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
KerbalEngineer -> FlightEngineerCore->Start
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
[ScenarioDestructibles]: Loading... 0 objects registered
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
[ScenarioUpgradeableFacilities]: Loading... 0 objects registered
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
Loading Depletion Nodes
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
DepNodeCount: 0
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
Loading Biome Nodes
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
BiomeNodeCount: 0
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
Loading Planet Nodes
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
PlanetNodeCount: 0
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
Contract Log: Outdated save file detected! All contracts in save file were updated!
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
[PartJoint]: None of the provided nodes was valid!
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
[PartJoint]: None of the provided nodes was valid!
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
[PlanetariumCamera]: Focus: Sanctuary Minmus
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
Flight State Captured
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
Saving Achievements Tree...
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
Saving Achievements Tree...
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
Saving Achievements Tree...
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
Saving Achievements Tree...
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
Saving Achievements Tree...
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
Game State Saved as persistent
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
Unpacking Sanctuary Minmus
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
NullReferenceException: Object reference not set to an instance of an object
at PartJoint.SetupJoint (Vector3 jointPos, Vector3 jointOrt, Vector3 jointOrt2, Int32 size) [0x00000] in <filename unknown>:0
at PartJoint.create (.Part child, .Part parent, UnityEngine.Transform nodeSpace, Vector3 nodePos, Vector3 nodeOrt, Vector3 nodeOrt2, Int32 nodeSize, AttachModes mode) [0x00000] in <filename unknown>:0
at PartJoint.Create (.Part owner, .Part parent, .AttachNode nodeToParent, .AttachNode nodeFromParent, AttachModes mode) [0x00000] in <filename unknown>:0
at Part.CreateAttachJoint (AttachModes mode) [0x00000] in <filename unknown>:0
at Part.SetHierarchyRoot (.Part root) [0x00000] in <filename unknown>:0
at Part.SetHierarchyRoot (.Part root) [0x00000] in <filename unknown>:0
at Part.Undock (.DockedVesselInfo newVesselInfo) [0x00000] in <filename unknown>:0
at ModuleDockingNode.Undock () [0x00000] in <filename unknown>:0
at BaseEvent.Invoke () [0x00000] in <filename unknown>:0
at UIPartActionButton.OnClick () [0x00000] in <filename unknown>:0
(Filename: Line: -1)
mk2LanderCabin collided into node_collider - relative velocity: 13.27923 - no impact momentum (no RB)
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
largeAdapter2 collided into node_collider - relative velocity: 14.63009 - no impact momentum (no RB)
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
Game Paused!
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
Game Unpaused!
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)
Can not play a disabled audio source
(Filename: Line: 377)
Game Paused!
(Filename: C:/buildslave/unity/build/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)