I'm getting the following error when using the PersonalNPC plugin when it gathers resources.

18:12:35) | Failed to call hook 'OnDispenserGather' on plugin 'Imperium v2.2.4' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.Imperium+Taxes.AwardBadlandsBonusIfApplicable (ResourceDispenser dispenser, BaseEntity entity, Item item) [0x0003f] in <06c47411053b40ada27f5fe9554c9e9d>:0 
  at Oxide.Plugins.Imperium.OnDispenserGather (ResourceDispenser dispenser, BaseEntity entity, Item item) [0x00008] in <06c47411053b40ada27f5fe9554c9e9d>:0 
  at Oxide.Plugins.Imperium.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x024f9] in <06c47411053b40ada27f5fe9554c9e9d>:0 
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <23ba99f131254889867c71f0bd137b1d>:0 
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <157a94ee66ab4a7991faecd1eb84be3b>:0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <157a94ee66ab4a7991faecd1eb84be3b>:0