KeyNotFoundException at GetStackSizeError

Getting this error whenever I try to use the stacksizecat or stacksizeall commands, help greatly apprecated

Failed to call hook 'SetStackCategoryCommand' on plugin 'StackSizeController v3.2.0' (KeyNotFoundException: The given key was not present in the dictionary.)
at System.Collections.Generic.Dictionary`2[TKey,TValue].get_Item (TKey key) [0x0001e] in <eae584ce26bc40229c1b1aa476bfa589>:0

at Oxide.Plugins.StackSizeController.GetStackSize (ItemDefinition itemDefinition) [0x0013d] in <28d24b166ab74ad49bf10f14e2bec2ad>:0

at Oxide.Plugins.StackSizeController.SetStackSizes () [0x00058] in <28d24b166ab74ad49bf10f14e2bec2ad>:0

at Oxide.Plugins.StackSizeController.SetStackCategoryCommand (Oxide.Core.Libraries.Covalence.IPlayer player, System.String command, System.String[] args) [0x000a7] in <28d24b166ab74ad49bf10f14e2bec2ad>:0

at Oxide.Plugins.StackSizeController.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00da0] in <28d24b166ab74ad49bf10f14e2bec2ad>:0

at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <31122a27a2414cd799150f8677cf39d4>:0

at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <c2afd8354b8b4f3ca451cf5a1aa111c3>:0

at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <c2afd8354b8b4f3ca451cf5a1aa111c3>:0

Plugin has been upgraded > 3.2.1 > 3.2.2 > 3.2.4 > now 3.3.0 !!