SteamVR　Hand.csのRender Model Prefabにつきまして　（SteamVR v2.0において、オリジナルの手のモデルを使用する方法）

お世話になります。
UnityのHand.csにございます、RenderModelPrefabについて質問がございます。

結論から申し上げますと、Hand.csで使用する手のモデルを下記のモデルと差し替えたいのですが、
https://assetstore.unity.com/packages/3d/characters/hands-for-vr-basic-54532

Skeleton等の設定が複雑で当方ではわからず・・・

やむを得ずRenderModelPrefabをNullにして、単にHand.csがAddComponentされているGameObjectの子供に、手のモデルを追従させております。

動作には問題ないのですが、Consoleに下記のようなエラーが毎フレームでて精神衛生上よろしくないです。

C#
1NullReferenceException: Object reference not set to an instance of an object
2Valve.VR.InteractionSystem.Hand.HandFollowUpdate () (at Assets/SteamVR/InteractionSystem/Core/Scripts/Hand.cs:1149)
3Valve.VR.InteractionSystem.Hand.OnTransformUpdated (Valve.VR.SteamVR_Behaviour_Pose updatedPose, Valve.VR.SteamVR_Input_Sources updatedSource) (at Assets/SteamVR/InteractionSystem/Core/Scripts/Hand.cs:808)
4Valve.VR.SteamVR_Behaviour_Pose.SteamVR_Behaviour_Pose_OnUpdate (Valve.VR.SteamVR_Action_Pose fromAction, Valve.VR.SteamVR_Input_Sources fromSource) (at Assets/SteamVR/Input/SteamVR_Behaviour_Pose.cs:121)
5Valve.VR.SteamVR_Action_Pose_Source.CheckAndSendEvents () (at Assets/SteamVR/Input/SteamVR_Action_Pose.cs:699)
6Valve.VR.SteamVR_Action_Pose_Source.UpdateValue (System.Boolean skipStateAndEventUpdates) (at Assets/SteamVR/Input/SteamVR_Action_Pose.cs:592)
7Valve.VR.SteamVR_Action_Pose_Source_Map`1[Source].UpdateValues (System.Boolean skipStateAndEventUpdates) (at Assets/SteamVR/Input/SteamVR_Action_Pose.cs:403)
8Valve.VR.SteamVR_Action_Pose_Base`2[SourceMap,SourceElement].UpdateValues (System.Boolean skipStateAndEventUpdates) (at Assets/SteamVR/Input/SteamVR_Action_Pose.cs:245)
9Valve.VR.SteamVR_Input.UpdatePoseActions (System.Boolean skipSendingEvents) (at Assets/SteamVR/Input/SteamVR_Input.cs:334)
10Valve.VR.SteamVR_Input.UpdateVisualActions (System.Boolean skipStateAndEventUpdates) (at Assets/SteamVR/Input/SteamVR_Input.cs:317)
11Valve.VR.SteamVR_Input.OnPreCull () (at Assets/SteamVR/Input/SteamVR_Input.cs:302)
12Valve.VR.SteamVR_Behaviour.PreCull () (at Assets/SteamVR/Scripts/SteamVR_Behaviour.cs:219)
13Valve.VR.SteamVR_Behaviour.OnBeforeRender () (at Assets/SteamVR/Scripts/SteamVR_Behaviour.cs:189)
14UnityEngine.BeforeRenderHelper.Invoke () (at C:/buildslave/unity/build/Runtime/Export/Graphics/BeforeRenderHelper.cs:92)
15UnityEngine.Application.InvokeOnBeforeRender () (at C:/buildslave/unity/build/Runtime/Export/Application/Application.cs:318)