error on startup

Failed to call hook 'OnItemAddedToContainer' on plugin 'Clans v1.1.28' (ArgumentNullException: Value cannot be null.
Parameter name: key)
  at System.Collections.Generic.Dictionary`2[TKey,TValue].FindEntry (TKey key) [0x00008] in <47fc8c70fa834cbf8141d7c1a7589125>:0 
  at System.Collections.Generic.Dictionary`2[TKey,TValue].TryGetValue (TKey key, TValue& value) [0x00000] in <47fc8c70fa834cbf8141d7c1a7589125>:0 
  at Oxide.Plugins.Clans.FindClanByPlayerFromCache (System.String userId) [0x00000] in <c4c59b28bb444c4b86eb286d02bdfd47>:0 
  at Oxide.Plugins.Clans.FindClanByPlayer (System.String userId) [0x00000] in <c4c59b28bb444c4b86eb286d02bdfd47>:0 
  at Oxide.Plugins.Clans.OnItemAddedToContainer (ItemContainer container, Item item) [0x00023] in <c4c59b28bb444c4b86eb286d02bdfd47>:0 
  at Oxide.Plugins.Clans.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x028ad] in <c4c59b28bb444c4b86eb286d02bdfd47>:0 
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <87ce9ac9776a48658bc55eae6debe38b>:0 
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <18d4f19bbc844191b11ed9e69284d09b>:0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <18d4f19bbc844191b11ed9e69284d09b>:0 
Failed to call hook 'OnItemAddedToContainer' on plugin 'Clans v1.1.28' (ArgumentNullException: Value cannot be null.
Parameter name: key)

Yes, I am aware of this error. I'm in the process of fixing it