error

[09:38:32] > Failed to call hook 'ShoppyStockConsoleCommand' on plugin 'ShoppyStock v2.0.7' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Ext.CarbonAliases.LUI.CreateText (Oxide.Ext.CarbonAliases.LUI+LuiContainer container, Oxide.Ext.CarbonAliases.LuiOffset offset, System.Int32 fontSize, System.String color, System.String text, UnityEngine.TextAnchor alignment, System.String name) [0x00000] in <8d5eac3d7c2543cb851b260642ab9512>:0 
  at Oxide.Plugins.ShoppyStock.DrawCategory (Oxide.Ext.CarbonAliases.CUI cui, BasePlayer player, Oxide.Plugins.ShoppyStock+ShoppyCache sc, System.Text.StringBuilder sb) [0x01008] in <949c8f2ad5bd4b10a5c16cc3feee7d0b>:0 
  at Oxide.Plugins.ShoppyStock.UpdateShopCategory (BasePlayer player, System.String newCategory, Oxide.Ext.CarbonAliases.CUI cui, System.Text.StringBuilder sb, Oxide.Plugins.ShoppyStock+ShoppyCache sc, System.Boolean force) [0x00109] in <949c8f2ad5bd4b10a5c16cc3feee7d0b>:0 
  at Oxide.Plugins.ShoppyStock.SwitchShopCategory (BasePlayer player, System.String newCategory, System.Boolean affordableSwitch, System.Boolean force) [0x0004f] in <949c8f2ad5bd4b10a5c16cc3feee7d0b>:0 
  at Oxide.Plugins.ShoppyStock.ShoppyStockConsoleCommand (ConsoleSystem+Arg arg) [0x00513] in <949c8f2ad5bd4b10a5c16cc3feee7d0b>:0 
  at Oxide.Plugins.ShoppyStock.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x04b89] in <949c8f2ad5bd4b10a5c16cc3feee7d0b>:0 
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <42f9bedc659b4f4786eb778d3cd58968>:0 
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000de] in <d59b507fd76240e5b62228d0eae39b73>:0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <d59b507fd76240e5b62228d0eae39b73>:0 

Hey, any way how to replicate that? Can you share me your config and data folder?

messages sent with files

with args: shop category SkillTree
[10:21:37] > [LUI] We couldn't find '2863540162' as valid item shortname. Ignoring.

[11:19:43] > [ShoppyStock] Player Don [76561199030769678] has ran ShoppyStock console command with args: close
[11:19:59] > 204.48.76.28:45612/76561199030769678/Don disconnecting: Exception (cs:129647): ArgumentOutOfRangeException: Index and count must refer to a location within the string.  Parameter name: count System.String.Remove (System.Int32 startIndex, System.Int32 count) (at <00000000000000000000000000000000>:0) TMPro.TMP_InputField.DeleteKey () (at <00000000000000000000000000000000>:0) TMPro.TMP_InputField.KeyPressed (UnityEngine.Event evt) (at <00000000000000000000000000000000>:0) TMPro.TMP_InputField.OnUpdateSelected (UnityEngine.EventSystems.BaseEventData eventData) (at <00000000000000000000000000000000>:0) UnityEngine.EventSystems.ExecuteEvents.Execute[T] (UnityEngine.GameObject target, UnityEngine.EventSystems.BaseEventData eventData, UnityEngine.EventSystems.ExecuteEvents+EventFunction`1[T1] functor) (at <00000000000000000000000000000000>:0) UnityEngine.EventSystems.StandaloneInputModule.SendUpdateEventToSelectedObject () (at <00000000000000000000000000000000>:0) UnityEngine.EventSystems.StandaloneInputModule.Process () (at <00000000000000000000000000000000>:0) UnityEngine.EventSystems.EventSystem.Update () (at <00000000000000000000000000000000>:0) UnityEngine.EventSystems.EventSystem:Update() 

You have xmas.present.small{2}-0 with "Item Shortname": "2863540162",
and it throws an error. just make it empty.

And i see you have more invalid shortnames like "easy" "medioum" etc. clear them all.