my spine version is 3.8 and i have a question.
I use spine for Unity.

characters are using SpineAnimation Component for moving and change skin.
but for some complex reason, thier skins are in different SkeletonDataAsset
and i have to change it on runtime.

So I did as below.

        SkeletonDataAsset skeletonDataAsset = ResourceManager.ResourcesObjectLoad<SkeletonDataAsset>(_SkeletonDataAssetPath);
        if (skeletonDataAsset == null)
            return false;

        _Skeleton.skeletonDataAsset = skeletonDataAsset;
        _SkeletonAnimation.initialSkinName = skinName;
        _SkeletonAnimation.Initialize(true);

Despite the change of skeleton asset data, character have to maintain state. So, i copied prev
AnimationState, to assign it in initialized SkeletonAnimation.

        AnimationState state = _SkeletonAnimation.AnimationState;

        SkeletonDataAsset skeletonDataAsset = ResourceManager.ResourcesObjectLoad<SkeletonDataAsset>(_SkeletonDataAssetPath);
        if (skeletonDataAsset == null)
            return false;

        _Skeleton.skeletonDataAsset = skeletonDataAsset;
        _SkeletonAnimation.initialSkinName = skinName;
        _SkeletonAnimation.Initialize(true);

        _SkeletonAnimation.state = state;

and this error code printed.

IndexOutOfRangeException: Index was outside the bounds of the array.
Spine.RotateTimeline.Apply (Spine.Skeleton skeleton, System.Single lastTime, System.Single time, Spine.ExposedList1[T] firedEvents, System.Single alpha, Spine.MixBlend blend, Spine.MixDirection direction) 
(at Assets/Spine/Runtime/spine-csharp/Animation.cs:351)
Spine.AnimationState.ApplyRotateTimeline (Spine.RotateTimeline timeline, Spine.Skeleton skeleton, System.Single time, System.Single alpha, Spine.MixBlend blend, System.Single[] timelinesRotation, System.Int32 i, System.Boolean firstFrame) 
(at Assets/Spine/Runtime/spine-csharp/AnimationState.cs:505)
Spine.AnimationState.ApplyMixingFrom (Spine.TrackEntry to, Spine.Skeleton skeleton, Spine.MixBlend blend) 
(at Assets/Spine/Runtime/spine-csharp/AnimationState.cs:406)
Spine.AnimationState.Apply (Spine.Skeleton skeleton) 
(at Assets/Spine/Runtime/spine-csharp/AnimationState.cs:242)
Spine.Unity.SkeletonAnimation.ApplyAnimation () 
(at Assets/Spine/Runtime/spine-unity/Components/SkeletonAnimation.cs:217)
Spine.Unity.SkeletonAnimation.Update (System.Single deltaTime) 
(at Assets/Spine/Runtime/spine-unity/Components/SkeletonAnimation.cs:203)
Spine.Unity.SkeletonAnimation.Update () (at Assets/Spine/Runtime/spine-unity/Components/SkeletonAnimation.cs:188)

I thought the reason is gap between prev and curr skin bone count, so added this code.

    if (skeleton.bones.Items.Length <= boneIndex)
        boneIndex = 0;
    Bone bone = skeleton.bones.Items[boneIndex];

Could this cause problems? I'm in dire need of help. Thank you.