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got this error when i try and open the mod settings in game.

[HugsLib][ERR] Exception during DoWindowContents: System.ArgumentNullException: Argument cannot be null.
Parameter name: key
  at System.Collections.Generic.Dictionary`2[Verse.RecipeDef,Verse.RecipeDef].ContainsKey (Verse.RecipeDef key) [0x00000] in <filename unknown>:0
  at Ad2mod.Ad2.IsNewRecipe (Verse.RecipeDef recipe) [0x00000] in <filename unknown>:0
  at Ad2mod.Ad2.FindRecipesUses () [0x00000] in <filename unknown>:0
  at Ad2mod.Ad2Mod.DoSettingsWindowContents (Rect inRect) [0x00000] in <filename unknown>:0
  at RimWorld.Dialog_VanillaModSettings.DoWindowContents (Rect inRect) [0x00000] in <filename unknown>:0
Verse.Log:Error(String, Boolean)
HugsLib.Utils.ModLogger:ReportException(Exception, String, Boolean, String)
RimWorld.Dialog_VanillaModSettings:DoWindowContents(Rect)
Verse.<WindowOnGUI>c__AnonStorey0:<>m__0(Int32)
UnityEngine.GUI:CallWindowDelegate(WindowFunction, Int32, Int32, GUISkin, Int32, Single, Single, GUIStyle)