Error after September forced wipe

Failed to call hook 'SpawnNpc' on plugin 'NpcSpawn v2.8.3' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.NpcSpawn+CustomScientistNpc.UpdateInventory () [0x00116] in <2cafd9ebb2ac4399ad29b5240f865bce>:0 
  at Oxide.Plugins.NpcSpawn+CustomScientistNpc.ServerInit () [0x00164] in <2cafd9ebb2ac4399ad29b5240f865bce>:0 
  at BaseNetworkable.Spawn () [0x0004f] in <10612f05f55048cf96012a34ab66cb3d>:0 
  at BaseEntity.Spawn () [0x00000] in <10612f05f55048cf96012a34ab66cb3d>:0 
  at Oxide.Plugins.NpcSpawn.CreateCustomNpc (UnityEngine.Vector3 position, Oxide.Plugins.NpcSpawn+NpcConfig config) [0x0007b] in <2cafd9ebb2ac4399ad29b5240f865bce>:0 
  at Oxide.Plugins.NpcSpawn.SpawnNpc (UnityEngine.Vector3 position, Newtonsoft.Json.Linq.JObject configJson) [0x00008] in <2cafd9ebb2ac4399ad29b5240f865bce>:0 
  at Oxide.Plugins.NpcSpawn.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x000b0] in <2cafd9ebb2ac4399ad29b5240f865bce>: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