Failed to call hook

(21:29:17) | Failed to call hook 'OnEntityTakeDamage' on plugin 'QualityCrafting v3.0.3' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.QualityCraftingExtensionMethods.ExtensionMethods.WornItems (BasePlayer basePlayer) [0x00006] in <e163f0693c21403fb0f2926578bae331>:0 
  at Oxide.Plugins.QualityCrafting.OnPlayerTakeDamage (BasePlayer basePlayer, HitInfo info) [0x00000] in <e163f0693c21403fb0f2926578bae331>:0 
  at Oxide.Plugins.QualityCrafting.OnEntityTakeDamage (BaseCombatEntity entity, HitInfo info) [0x001b8] in <e163f0693c21403fb0f2926578bae331>:0 
  at Oxide.Plugins.QualityCrafting.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00911] in <e163f0693c21403fb0f2926578bae331>:0 
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <206a0f2c6ee141f38e2ad549cde44d70>:0 
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000de] in <beb2b64691c64e2b95b99491bd85442c>:0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <beb2b64691c64e2b95b99491bd85442c>:0

I just saw that this appears in the console, but when exactly I can't say

Seems to be when a player was attacked by something?

Unfortunately I don't know, I only saw it in the console.