Error spam and breaking linked storage

So had player bring this up as their combined storage stopped working randomly. They tried to split a stack of blue keycards and caused this initial error
https://imgur.com/R4EweDq

Then following that error anytime they touch their combined storage it spams this in console and they can't access the plugin
https://imgur.com/a6RtPtN

same here, some item just make plugin stop working and spam in console

[Error] Failed to call hook 'CanLootEntity' on plugin 'CombinedStorage v1.0.1' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.CombinedStorage+ItemCopy..ctor (Item sourceItem) [0x00020] in <c93abfaf4c0c4932881f55f267a31738>:0 
  at Oxide.Plugins.CombinedStorage.GetItemCopy (Item sourceItem) [0x00000] in <c93abfaf4c0c4932881f55f267a31738>:0 
  at Oxide.Plugins.CombinedStorage+CombinedStorageSession.RefreshStorage (System.Boolean onlyItems) [0x00170] in <c93abfaf4c0c4932881f55f267a31738>:0 
  at Oxide.Plugins.CombinedStorage.ShowCombinedStorage (BasePlayer basePlayer, BoxStorage storage, BuildingPrivlidge priv) [0x00094] in <c93abfaf4c0c4932881f55f267a31738>:0 
  at Oxide.Plugins.CombinedStorage.CanLootEntity (BasePlayer basePlayer, BoxStorage storage) [0x000a0] in <c93abfaf4c0c4932881f55f267a31738>:0 
  at Oxide.Plugins.CombinedStorage.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x006fc] in <c93abfaf4c0c4932881f55f267a31738>: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