Failed to call hook

I am unsure when it comes to this line of code all i know it spams the console for each time a player kills a barrel

"Failed to call hook 'OnEntityDeath' on plugin 'GatherLootMultiplier v1.6.1' (NullReferenceException: Object reference not set to an instance of an object.)
  at Oxide.Plugins.GatherLootMultiplier.OnEntityDeath (LootContainer container, HitInfo info) [0x0004c] in <f82fdc69939e4bcf84d9527e885fb8ac>:0 
  at Oxide.Plugins.GatherLootMultiplier.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x0046f] in <f82fdc69939e4bcf84d9527e885fb8ac>: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 <112d89ea5d3348c8b949af0ab1a866d2>:0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <112d89ea5d3348c8b949af0ab1a866d2>:0 
Calling kill - but already IsDestroyed!? loot_barrel_1"

Changed Status from Pending to Work in Progress

Changed Status from Work in Progress to Closed

Changed Fixed In to Next Version