crash after load save

Exception in: (BeeHive).DrowningStates.root.drown.Transition(root.drown_pst) 
System.NullReferenceException: Object reference not set to an instance of an object
  at DrowningStates.UpdateSafeCell (DrowningStates+Instance smi) [0x00016] in C:\jenkins_workspace\workspace\SimGame_Windows\game\Assets\scripts\Mods\Fauna\Chores\DrowningStates.cs:61 
  at GameStateMachine`4+State+<>c__DisplayClass104_0[StateMachineType,StateMachineInstanceType,MasterType,DefType].<Transition>b__0 (StateMachineInstanceType smi) [0x00001] in C:\jenkins_workspace\workspace\SimGame_Windows\game\Assets\scripts\ai\statemachine\GameStateMachine.cs:2411 
  at StateMachine`4+GenericInstance[StateMachineType,StateMachineInstanceType,MasterType,DefType].ExecuteActions (StateMachine`4+State[StateMachineType,StateMachineInstanceType,MasterType,DefType] state, System.Collections.Generic.List`1[T] actions) [0x00057] in C:\jenkins_workspace\workspace\SimGame_Windows\game\Assets\scripts\ai\statemachine\StateMachine.cs:874 

UnityEngine.Debug:LogError(Object, Object)
Debug:LogError(Object, Object) (at C:/jenkins_workspace/workspace/SimGame_Windows/game/Assets/Plugins/Debug.cs:152)
DebugUtil:LogErrorArgs(Object, Object[]) (at C:/jenkins_workspace/workspace/SimGame_Windows/game/Assets/Plugins/Klei/util/DebugUtil.cs:191)
DebugUtil:LogException(Object, String, Exception) (at C:/jenkins_workspace/workspace/SimGame_Windows/game/Assets/Plugins/Klei/util/DebugUtil.cs:201)
GenericInstance:ExecuteActions(State, List`1) (at C:/jenkins_workspace/workspace/SimGame_Windows/game/Assets/scripts/ai/statemachine/StateMachine.cs:908)
GenericInstance:PushState(BaseState) (at C:/jenkins_workspace/workspace/SimGame_Windows/game/Assets/scripts/ai/statemachine/StateMachine.cs:833)
GenericInstance:GoTo(BaseState) (at C:/jenkins_workspace/workspace/SimGame_Windows/game/Assets/scripts/ai/statemachine/StateMachine.cs:1128)
Instance:StartSM() (at C:/jenkins_workspace/workspace/SimGame_Windows/game/Assets/scripts/ai/statemachine/StateMachine.cs:252)
GenericInstance:StartSM() (at C:/jenkins_workspace/workspace/SimGame_Windows/game/Assets/scripts/ai/statemachine/StateMachine.cs:997)
Chore:Begin(Context) (at C:/jenkins_workspace/workspace/SimGame_Windows/game/Assets/scripts/ai/demands/Chore.cs:710)
StatesInstance:BeginChore() (at C:/jenkins_workspace/workspace/SimGame_Windows/game/Assets/scripts/ai/demands/ChoreDriver.cs:30)
<>c:<InitializeStates>b__5_2(StatesInstance) (at C:/jenkins_workspace/workspace/SimGame_Windows/game/Assets/scripts/ai/demands/ChoreDriver.cs:107)
GenericInstance:ExecuteActions(State, List`1) (at C:/jenkins_workspace/workspace/SimGame_Windows/game/Assets/scripts/ai/statemachine/StateMachine.cs:874)
GenericInstance:PushState(BaseState) (at C:/jenkins_workspace/workspace/SimGame_Windows/game/Assets/scripts/ai/statemachine/StateMachine.cs:833)
GenericInstance:GoTo(BaseState) (at C:/jenkins_workspace/workspace/SimGame_Windows/game/Assets/scripts/ai/statemachine/StateMachine.cs:1128)
Transition:Evaluate(StatesInstance) (at C:/jenkins_workspace/workspace/SimGame_Windows/game/Assets/scripts/ai/statemachine/StateMachine.cs:1280)
Context:Set(Chore, StatesInstance) (at C:/jenkins_workspace/workspace/SimGame_Windows/game/Assets/scripts/ai/statemachine/StateMachine.cs:1356)
Parameter`1:Set(Chore, StatesInstance) (at C:/jenkins_workspace/workspace/SimGame_Windows/game/Assets/scripts/ai/statemachine/StateMachine.cs:1238)
ChoreDriver:SetChore(Context) (at C:/jenkins_workspace/workspace/SimGame_Windows/game/Assets/scripts/ai/demands/ChoreDriver.cs:172)
Brain:UpdateChores() (at C:/jenkins_workspace/workspace/SimGame_Windows/game/Assets/scripts/ai/Brain.cs:80)
Brain:UpdateBrain() (at C:/jenkins_workspace/workspace/SimGame_Windows/game/Assets/scripts/ai/Brain.cs:57)
BrainGroup:RenderEveryTick(Single, Boolean) (at C:/jenkins_workspace/workspace/SimGame_Windows/game/Assets/scripts/ai/BrainScheduler.cs:207)
BrainScheduler:RenderEveryTick(Single) (at C:/jenkins_workspace/workspace/SimGame_Windows/game/Assets/scripts/ai/BrainScheduler.cs:360)
RenderEveryTickUpdater:Update(IRenderEveryTick, Single) (at C:/jenkins_workspace/workspace/SimGame_Windows/game/Assets/Plugins/Klei/util/SimAndRenderScheduler.cs:188)
UpdateBucketWithUpdater`1:Update(Single) (at C:/jenkins_workspace/workspace/SimGame_Windows/game/Assets/Plugins/Klei/util/StateMachineUpdater.cs:79)
BucketGroup:AdvanceOneSubTick(Single) (at C:/jenkins_workspace/workspace/SimGame_Windows/game/Assets/Plugins/Klei/util/StateMachineUpdater.cs:152)
StateMachineUpdater:RenderEveryTick(Single) (at C:/jenkins_workspace/workspace/SimGame_Windows/game/Assets/Plugins/Klei/util/StateMachineUpdater.cs:264)
Game:LateUpdate() (at C:/jenkins_workspace/workspace/SimGame_Windows/game/Assets/scripts/game/Game.cs:1603)
 

방사선행성 Cycle 307.sav