error message in console

Several times I got this message in the console, Is it important or can I ignore it? :

Failed to call hook 'OpenExtraPocketsButton' on plugin 'SkillTree v1.3.6' (NullReferenceException: Object reference not set to an instance of an object)
at Oxide.Plugins.SkillTree.GetRestoreItem (BasePlayer player, ItemContainer container, Oxide.Plugins.SkillTree+ItemInfo savedItem) [0x00046] in <9f03914f126f49889e6c3968468c6e50>:0
at Oxide.Plugins.SkillTree.FetchItems (BasePlayer player, ItemContainer container) [0x0006b] in <9f03914f126f49889e6c3968468c6e50>:0
at Oxide.Plugins.SkillTree.GenerateBag (BasePlayer player, System.Int32 slots) [0x00095] in <9f03914f126f49889e6c3968468c6e50>:0
at Oxide.Plugins.SkillTree.OpenBag (BasePlayer player) [0x00185] in <9f03914f126f49889e6c3968468c6e50>:0
at Oxide.Plugins.SkillTree.OpenExtraPocketsButton (ConsoleSystem+Arg arg) [0x00014] in <9f03914f126f49889e6c3968468c6e50>:0
at Oxide.Plugins.SkillTree.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x052b3] in <9f03914f126f49889e6c3968468c6e50>: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

Can probably ignore it. If you figure out who is failing to open their extra pockets bag, you can send me the data file with their steam ID so I can take a peak.

Changed Status from Pending to Closed