Is this error for here, or Achtung/Simple Sidearms?

All I did to get this error was right click on a weapon to equip it, and the error has just started as of this morning (15th Oct - this mod is the only one that has updated between me playing yesterday - 14th)

System.NullReferenceException: Object reference not set to an instance of an object
at AwesomeInventory.SimpleSidearmUtility..cctor () [0x0009b] in <0dd66136c5b74bbaaf0a85c660d18758>:0
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Error (string)
AwesomeInventory.SimpleSidearmUtility:.cctor ()
AwesomeInventory.Common.HarmonyPatches.AddHumanlikeOrders_AwesomeInventory_Patch:Postfix (UnityEngine.Vector3,Verse.Pawn,System.Collections.Generic.List`1<Verse.FloatMenuOption>)
(wrapper dynamic-method) RimWorld.FloatMenuMakerMap:RimWorld.FloatMenuMakerMap.AddHumanlikeOrders_Patch7 (UnityEngine.Vector3,Verse.Pawn,System.Collections.Generic.List`1<Verse.FloatMenuOption>)
(wrapper dynamic-method) RimWorld.FloatMenuMakerMap:RimWorld.FloatMenuMakerMap.ChoicesAtFor_Patch3 (UnityEngine.Vector3,Verse.Pawn,bool)
AchtungMod.MultiActions:AddColonist (AchtungMod.Colonist)
AchtungMod.MultiActions:<.ctor>b__3_0 (AchtungMod.Colonist)
AchtungMod.Tools:Do<AchtungMod.Colonist> (System.Collections.Generic.IEnumerable`1<AchtungMod.Colonist>,System.Action`1<AchtungMod.Colonist>)
AchtungMod.MultiActions:.ctor (System.Collections.Generic.IEnumerable`1<AchtungMod.Colonist>,UnityEngine.Vector3)
AchtungMod.Controller:MouseDown (UnityEngine.Vector3)
AchtungMod.Controller:HandleEvents ()
AchtungMod.Selector_HandleMapClicks_Patch:Prefix ()
(wrapper dynamic-method) RimWorld.Selector:RimWorld.Selector.HandleMapClicks_Patch1 (RimWorld.Selector)
RimWorld.Selector:SelectorOnGUI ()
RimWorld.MapInterface:HandleLowPriorityInput ()
RimWorld.UIRoot_Play:UIRootOnGUI ()
Verse.Root:OnGUI ()