Plugin not working after server restart

Hi,

I'm having problems with the plugin. When I upload something to the locker, the plugin stops working after the server restarts, and this error appears every time the server saves:

Failed to call hook 'OnServerSave' on plugin 'PortableLocker v1.5.3' (NullReferenceException: Object reference not set to an instance of an object) at Oxide.Plugins.PortableLocker.SaveContainer () [0x0009d] in <7064b76c3a254cff8dc38e088e998847>:0 at Oxide.Plugins.PortableLocker.OnServerSave () [0x00008] in <7064b76c3a254cff8dc38e088e998847>:0 at Oxide.Plugins.PortableLocker.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00168] in <7064b76c3a254cff8dc38e088e998847>: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 <15f61ddda771464d8246ebdce8ff4811>:0 at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <15f61ddda771464d8246ebdce8ff4811>:0

I've noticed that the plugin crashes when someone stores an EpicLoot item. Before the Rust update, everything worked fine, even with EpicLoot items.