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I've been enjoying a new "Royalty only" colony, but yesterday when I reached Praetor on my second titled pawn (after reaching Count on another pawn), I can't draft that new Praetor. When I use debug to lower the title down one, I can draft again, and when I use debug to put Praetor (or anything higher) back again, I can't draft, and always see this same error in the debug log:

System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.NullReferenceException: Object reference not set to an instance of an object
  at RimWorld.Command_AbilitySpeech..ctor (RimWorld.Ability ability) [0x00013] in <cdbd0ed5089a418da09b9a259f9dbd8f>:0
  at (wrapper managed-to-native) System.Reflection.MonoCMethod.InternalInvoke(System.Reflection.MonoCMethod,object,object[],System.Exception&)
  at System.Reflection.MonoCMethod.InternalInvoke (System.Object obj, System.Object[] parameters) [0x00002] in <eae584ce26bc40229c1b1aa476bfa589>:0
   --- End of inner exception stack trace ---
  at System.Reflection.MonoCMethod.InternalInvoke (System.Object obj, System.Object[] parameters) [0x00014] in <eae584ce26bc40229c1b1aa476bfa589>:0
  at System.Reflection.MonoCMethod.DoInvoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x0007a] in <eae584ce26bc40229c1b1aa476bfa589>:0
  at System.Reflection.MonoCMethod.Invoke (System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <eae584ce26bc40229c1b1aa476bfa589>:0
  at System.RuntimeType.CreateInstanceImpl (System.Reflection.BindingFlags bindingAttr, System.Reflection.Binder binder, System.Object[] args, System.Globalization.CultureInfo culture, System.Object[] activationAttributes, System.Threading.StackCrawlMark& stackMark) [0x00213] in <eae584ce26bc40229c1b1aa476bfa589>:0
  at System.Activator.CreateInstance (System.Type type, System.Reflection.BindingFlags bindingAttr, System.Reflection.Binder binder, System.Object[] args, System.Globalization.CultureInfo culture, System.Object[] activationAttributes) [0x00095] in <eae584ce26bc40229c1b1aa476bfa589>:0
  at System.Activator.CreateInstance (System.Type type, System.Object[] args) [0x00000] in <eae584ce26bc40229c1b1aa476bfa589>:0
  at RimWorld.Ability+<GetGizmos>d__70.MoveNext () [0x00031] in <cdbd0ed5089a418da09b9a259f9dbd8f>:0
  at RimWorld.Pawn_AbilityTracker+<GetGizmos>d__11.MoveNext () [0x000b5] in <cdbd0ed5089a418da09b9a259f9dbd8f>:0
  at Verse.Pawn+<GetGizmos>d__234.MoveNext () [0x00358] in <cdbd0ed5089a418da09b9a259f9dbd8f>:0
  at System.Collections.Generic.List`1[T].InsertRange (System.Int32 index, System.Collections.Generic.IEnumerable`1[T] collection) [0x000db] in <eae584ce26bc40229c1b1aa476bfa589>:0
  at System.Collections.Generic.List`1[T].AddRange (System.Collections.Generic.IEnumerable`1[T] collection) [0x00000] in <eae584ce26bc40229c1b1aa476bfa589>:0
  at RimWorld.InspectGizmoGrid.DrawInspectGizmoGridFor (System.Collections.Generic.IEnumerable`1[T] selectedObjects, Verse.Gizmo& mouseoverGizmo) [0x00045] in <cdbd0ed5089a418da09b9a259f9dbd8f>:0
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Error (string)
Verse.Log:ErrorOnce (string,int)
RimWorld.InspectGizmoGrid:DrawInspectGizmoGridFor (System.Collections.Generic.IEnumerable`1<object>,Verse.Gizmo&)
RimWorld.MainTabWindow_Inspect:DrawInspectGizmos ()
RimWorld.InspectPaneUtility:ExtraOnGUI (RimWorld.IInspectPane)
RimWorld.MainTabWindow_Inspect:ExtraOnGUI ()
Verse.WindowStack:WindowStackOnGUI ()
RimWorld.UIRoot_Play:UIRootOnGUI ()
Verse.Root:OnGUI ()