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Just was playing as normal, when two of my pawns get the flu. I go to heal them and right click them when it doesn't pop up the option to force-heal them, this is on a new save. Going to Copy-paste the log I got going into dev mode.

Root level exception in OnGUI(): System.InvalidOperationException: Sequence contains no elements
  at Verse.GenCollection.MaxBy[TSource,TKey] (System.Collections.Generic.IEnumerable`1[T] source, System.Func`2[T,TResult] selector, System.Collections.Generic.IComparer`1[T] comparer) [0x00039] in <d243303f714d4dc48680ccaecd2f594e>:0
  at Verse.GenCollection.MaxBy[TSource,TKey] (System.Collections.Generic.IEnumerable`1[T] source, System.Func`2[T,TResult] selector) [0x00007] in <d243303f714d4dc48680ccaecd2f594e>:0
  at Pharmacist.HealthAIUtility_FindBestMedicine.Prefix (Verse.Pawn healer, Verse.Pawn patient, System.Boolean onlyUseInventory, Verse.Thing& __result) [0x00057] in <60f543b514a84700bb9fdd05e7dc9499>:0
  at (wrapper dynamic-method) RimWorld.HealthAIUtility.RimWorld.HealthAIUtility.FindBestMedicine_Patch3(Verse.Pawn,Verse.Pawn,bool)
  at RimWorld.WorkGiver_Tend.JobOnThing (Verse.Pawn pawn, Verse.Thing t, System.Boolean forced) [0x00007] in <d243303f714d4dc48680ccaecd2f594e>:0
  at (wrapper dynamic-method) RimWorld.FloatMenuMakerMap.RimWorld.FloatMenuMakerMap.AddJobGiverWorkOrders_Patch0(UnityEngine.Vector3,Verse.Pawn,System.Collections.Generic.List`1<Verse.FloatMenuOption>,bool)
  at RimWorld.FloatMenuMakerMap.AddUndraftedOrders (UnityEngine.Vector3 clickPos, Verse.Pawn pawn, System.Collections.Generic.List`1[T] opts) [0x00085] in <d243303f714d4dc48680ccaecd2f594e>:0
  at (wrapper dynamic-method) RimWorld.FloatMenuMakerMap.RimWorld.FloatMenuMakerMap.ChoicesAtFor_Patch1(UnityEngine.Vector3,Verse.Pawn,bool)
  at RimWorld.FloatMenuMakerMap.TryMakeFloatMenu (Verse.Pawn pawn) [0x000a1] in <d243303f714d4dc48680ccaecd2f594e>:0
  at (wrapper dynamic-method) RimWorld.Selector.RimWorld.Selector.HandleMapClicks_Patch1(RimWorld.Selector)
  at RimWorld.Selector.SelectorOnGUI () [0x00000] in <d243303f714d4dc48680ccaecd2f594e>:0
  at RimWorld.MapInterface.HandleLowPriorityInput () [0x0000f] in <d243303f714d4dc48680ccaecd2f594e>:0
  at RimWorld.UIRoot_Play.UIRootOnGUI () [0x000dd] in <d243303f714d4dc48680ccaecd2f594e>:0
  at (wrapper dynamic-method) Verse.Root.Verse.Root.OnGUI_Patch1(Verse.Root)
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Error (string)
(wrapper dynamic-method) Verse.Root:Verse.Root.OnGUI_Patch1 (Verse.Root)