Refining Wolframite Crashes with NullReferenceException

I attempted to create refined wolframite in the metal refinery and my game crashes.
Log attached, lines of interest:

[21:32:51.995] [1] Exception in: (MetalRefineryComplete).WorkChore`1+States[[Refinery, Assembly-CSharp, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null]].root.work.Work()
System.NullReferenceException: Object reference not set to an instance of an object
  at Refinery.UpdateOrderQueue (Boolean force_update) [0x00366] in D:\JenkinsWorkspace\Release_SimGame_Windows\game\Assets\scripts\game\Buildings\Refinery.cs:508 
  at Refinery.OnCompleteWork (.Worker worker) [0x00096] in D:\JenkinsWorkspace\Release_SimGame_Windows\game\Assets\scripts\game\Buildings\Refinery.cs:617 
  at Workable.CompleteWork (.Worker worker) [0x00046] in D:\JenkinsWorkspace\Release_SimGame_Windows\game\Assets\scripts\components\Workable.cs:257 
  at Worker.CompleteWork () [0x0002f] in D:\JenkinsWorkspace\Release_SimGame_Windows\game\Assets\scripts\components\Worker.cs:90 
  at GameStateMachine`4+State+<ToggleWork>c__AnonStorey2E[WorkChore`1+States[Refinery],WorkChore`1+StatesInstance[Refinery],WorkChore`1[Refinery],System.Object].<>m__1 (.StatesInstance smi) [0x0002d] in D:\JenkinsWorkspace\Release_SimGame_Windows\game\Assets\scripts\ai\statemachine\GameStateMachine.cs:1713 
  at StateMachine`4+GenericInstance[WorkChore`1+States[Refinery],WorkChore`1+StatesInstance[Refinery],WorkChore`1[Refinery],System.Object].ExecuteActions (.State state, .Action[] actions, Boolean should_log) [0x00043] in D:\JenkinsWorkspace\Release_SimGame_Windows\game\Assets\scripts\ai\statemachine\StateMachine.cs:872 
UnityEngine.DebugLogHandler:Internal_Log(LogType, String, Object)
UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[])
UnityEngine.Logger:Log(LogType, Object, Object)
UnityEngine.Debug:LogError(Object, Object)
Debug:LogError(Object, Object) (at D:\JenkinsWorkspace\Release_SimGame_Windows\game\Assets\Plugins\Debug.cs:100)
Output:LogErrorWithObj(Object, String) (at D:\JenkinsWorkspace\Release_SimGame_Windows\game\Assets\Plugins\Output.cs:168)
Output:LogErrorWithObj(Object, Object[]) (at D:\JenkinsWorkspace\Release_SimGame_Windows\game\Assets\Plugins\Output.cs:52)
GenericInstance:ExecuteActions(State, Action[], Boolean) (at D:\JenkinsWorkspace\Release_SimGame_Windows\game\Assets\scripts\ai\statemachine\StateMachine.cs:887)
GenericInstance:Update() (at D:\JenkinsWorkspace\Release_SimGame_Windows\game\Assets\scripts\ai\statemachine\StateMachine.cs:723)
GenericInstance:<PushState>m__0(Object) (at D:\JenkinsWorkspace\Release_SimGame_Windows\game\Assets\scripts\ai\statemachine\StateMachine.cs:770)
SystemScheduler:Update() (at D:\JenkinsWorkspace\Release_SimGame_Windows\game\Assets\scripts\components\SystemScheduler.cs:86)
Global:Update() (at D:\JenkinsWorkspace\Release_SimGame_Windows\game\Assets\scripts\game\Global.cs:87)

Attached is a log and the save file. Refinery can be found above base, near the batteries and transformers

output_log.txt

The Phlegm-Coated Acropolis.sav