NullReferenceException at OnItemCraftSolved

Hi, this is popping up in console every now and then. Any idea what's going on?

(16:30:01) | Failed to call hook 'OnItemCraft' on plugin 'MagicCraft v0.3.4' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.MagicCraft.OnItemCraft (ItemCraftTask task, BasePlayer crafter) [0x00027] in <71a94253e4ac420b8bd3abd2da86a024>:0 
  at Oxide.Plugins.MagicCraft.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x000f5] in <71a94253e4ac420b8bd3abd2da86a024>:0 
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <9affce1cd15c4ec183941adef8db1722>:0 
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <4452f821def6406d834e4149849fe7ea>:0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <4452f821def6406d834e4149849fe7ea>:0
Delete your lang file and configuration, reload your plugin and tell me if that fixes it. Haven't been able to replicate this.
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