No Surgery Bills Display

[JoshMayberry]

If I try clicking on "Operations" in the health tab, then no bills show up.
Using debug mode- I was able to catch the log message that appears when I click the button:

Exception filling tab RimWorld.ITab_Pawn_Health: System.NullReferenceException: Object reference not set to an instance of an object
[Ref 4252800F]
 at RimWorld.Recipe_InstallArtificialBodyPart+<>c__DisplayClass0_0.<GetPartsToApplyOn>b__0 (Verse.BodyPartRecord record) [0x00034] in <69945a8ed6c540cf90b578de735e0605>:0 
 at RimWorld.MedicalRecipesUtility+<GetFixedPartsToApplyOn>d__5.MoveNext () [0x0009e] in <69945a8ed6c540cf90b578de735e0605>:0 
     - TRANSPILER rimworld.erdelf.alien_race.main: IEnumerable`1 AlienRace.HarmonyPatches:BodyReferenceTranspiler(IEnumerable`1 instructions)
 at RimWorld.HealthCardUtility+<>c__DisplayClass27_0.<DrawMedOperationsTab>b__0 () [0x00141] in <69945a8ed6c540cf90b578de735e0605>:0 
 at RimWorld.BillStack.DoListing (UnityEngine.Rect rect, System.Func`1[TResult] recipeOptionsMaker, UnityEngine.Vector2& scrollPosition, System.Single& viewHeight) [0x00082] in <69945a8ed6c540cf90b578de735e0605>:0 
 at RimWorld.HealthCardUtility.DrawMedOperationsTab (UnityEngine.Rect leftRect, Verse.Pawn pawn, Verse.Thing thingForMedBills, System.Single curY) [0x00063] in <69945a8ed6c540cf90b578de735e0605>:0 
 at RimWorld.HealthCardUtility.DrawHealthSummary (UnityEngine.Rect rect, Verse.Pawn pawn, System.Boolean allowOperations, Verse.Thing thingForMedBills) [0x0014e] in <69945a8ed6c540cf90b578de735e0605>:0 
 at RimWorld.HealthCardUtility.DrawPawnHealthCard (UnityEngine.Rect outRect, Verse.Pawn pawn, System.Boolean allowOperations, System.Boolean showBloodLoss, Verse.Thing thingForMedBills) [0x000ae] in <69945a8ed6c540cf90b578de735e0605>:0 
 at RimWorld.ITab_Pawn_Health.FillTab () [0x0003d] in <69945a8ed6c540cf90b578de735e0605>:0 
 at Verse.InspectTabBase+<>c__DisplayClass19_0.<DoTabGUI>b__0 () [0x00039] in <69945a8ed6c540cf90b578de735e0605>:0 
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Log.Error_Patch2 (string)
Verse.Log:ErrorOnce (string,int)
Verse.InspectTabBase/<>c__DisplayClass19_0:<DoTabGUI>b__0 ()
Verse.ImmediateWindow:DoWindowContents (UnityEngine.Rect)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Window.InnerWindowOnGUI_Patch0 (Verse.Window,int)
UnityEngine.GUI:CallWindowDelegate (UnityEngine.GUI/WindowFunction,int,int,UnityEngine.GUISkin,int,single,single,UnityEngine.GUIStyle)

When I remove this mod- then things work again.