Getting error in console when CH-47 spawns

When CH-47  spawn I am getting this error.

(20:16:14) | Failed to call hook 'OnHelicopterDropCrate' on plugin 'BetterNpc v1.3.3' (KeyNotFoundException: The given key 'CH47' was not present in the dictionary.)at System.Collections.Generic.Dictionary`2[TKey,TValue].get_Item (TKey key) [0x0001e] in <8ce0bd04a7a04b4b9395538239d3fdd8>:0at Oxide.Plugins.BetterNpc.OnHelicopterDropCrate (CH47HelicopterAIController ai) [0x00000] in <a421b45918e649ee8e8f9b87eb118651>:0at Oxide.Plugins.BetterNpc.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x007f6] in <a421b45918e649ee8e8f9b87eb118651>:0at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <42f9bedc659b4f4786eb778d3cd58968>:0at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000de] in <112d89ea5d3348c8b949af0ab1a866d2>:0at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <112d89ea5d3348c8b949af0ab1a866d2>:0

Same here