Error

After installing techtree
I haven't used it much, but the following error is displayed.
Please tell me the cause and solution.

Failed to call hook 'OnPlayerInput' on plugin 'TechTree v1.3.17' (NullReferenceException: Object reference not set to an instance of an object)

at Oxide.Plugins.TechTree+PlayerController.RequestOpenWorkbench () [0x00007] in <52869c17522746be8370bb9c2f2aa0d3>:0

at Oxide.Plugins.TechTree.OnPlayerInput (BasePlayer player, InputState input) [0x00065] in <52869c17522746be8370bb9c2f2aa0d3>:0

at Oxide.Plugins.TechTree.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x0049a] in <52869c17522746be8370bb9c2f2aa0d3>: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

Sry i update that in 5 minutes