diff --git a/Assets/VRM/Editor/Format/VRMEditorExporter.cs b/Assets/VRM/Editor/Format/VRMEditorExporter.cs
index ce0187b24..74bc3a710 100644
--- a/Assets/VRM/Editor/Format/VRMEditorExporter.cs
+++ b/Assets/VRM/Editor/Format/VRMEditorExporter.cs
@@ -28,7 +28,8 @@ namespace VRM
             {
                 foreach (var x in destroy)
                 {
-                    Debug.LogFormat("destroy: {0}", x.name);
+                    // x.name がエラーを引き起こす場合がある
+                    // Debug.LogFormat("destroy: {0}", x.name);
                     GameObject.DestroyImmediate(x);
                 }
             }
@@ -54,7 +55,7 @@ namespace VRM
                 {
                     continue;
                 }
-                
+
                 if (removeUnknown && clip.Preset == BlendShapePreset.Unknown)
                 {
                     continue;
diff --git a/Assets/VRM/Runtime/SpringBone/VRMSpringUtility.cs b/Assets/VRM/Runtime/SpringBone/VRMSpringUtility.cs
index 31bba0a94..634d43ebe 100644
--- a/Assets/VRM/Runtime/SpringBone/VRMSpringUtility.cs
+++ b/Assets/VRM/Runtime/SpringBone/VRMSpringUtility.cs
@@ -145,7 +145,7 @@ namespace VRM
                 foreach (var boneGroup in secondaryAnimation.boneGroups)
                 {
                     var vrmBoneGroup = secondary.gameObject.AddComponent<VRMSpringBone>();
-                    if (tryGetNode(boneGroup.center, out var node))
+                    if (boneGroup.center != -1 && tryGetNode(boneGroup.center, out var node))
                     {
                         vrmBoneGroup.m_center = node;
                     }
diff --git a/Assets/VRM/Tests/VRMLookAtTests.cs b/Assets/VRM/Tests/VRMLookAtTests.cs
index 95c197326..a9a07b4a3 100644
--- a/Assets/VRM/Tests/VRMLookAtTests.cs
+++ b/Assets/VRM/Tests/VRMLookAtTests.cs
@@ -1,4 +1,5 @@
 
+using System;
 using System.IO;
 using NUnit.Framework;
 using UniGLTF;
@@ -32,11 +33,10 @@ namespace VRM
                 var fp = go.GetComponent<VRMFirstPerson>();
                 GameObject.DestroyImmediate(go.GetComponent<VRMLookAtBoneApplyer>());
                 var lookAt = go.AddComponent<VRMLookAtBlendShapeApplyer>();
-                bytes = VRMEditorExporter.Export(go, null, new VRMExportSettings
-                {
-                    PoseFreeze = true,
-                });
-            }
+                var settings = (VRMExportSettings)ScriptableObject.CreateInstance<VRMExportSettings>();
+                settings.PoseFreeze = true;
+                    bytes = VRMEditorExporter.Export(go, null, settings);
+                }
 
             using (var data2 = new GlbLowLevelParser(AliciaPath, bytes).Parse())
             using (var loader2 = new VRMImporterContext(new VRMData(data2)))
@@ -61,10 +61,9 @@ namespace VRM
                 var fp = go.GetComponent<VRMFirstPerson>();
                 var lookAt = go.GetComponent<VRMLookAtBoneApplyer>();
                 horizontalInner = lookAt.HorizontalInner;
-                bytes = VRMEditorExporter.Export(go, null, new VRMExportSettings
-                {
-                    PoseFreeze = true,
-                });
+                var settings = ScriptableObject.CreateInstance<VRMExportSettings>();
+                settings.PoseFreeze = true;
+                bytes = VRMEditorExporter.Export(go, null, settings);
             }
 
             using (var data2 = new GlbLowLevelParser(AliciaPath, bytes).Parse())
@@ -95,10 +94,9 @@ namespace VRM
                 var fp = go.GetComponent<VRMFirstPerson>();
                 var lookAt = go.GetComponent<VRMLookAtBoneApplyer>();
                 horizontalInner = lookAt.HorizontalInner;
-                bytes = VRMEditorExporter.Export(go, null, new VRMExportSettings
-                {
-                    PoseFreeze = false,
-                });
+                var settings = (VRMExportSettings)ScriptableObject.CreateInstance<VRMExportSettings>();
+                settings.PoseFreeze = false;
+                bytes = VRMEditorExporter.Export(go, null, settings);
             }
 
             using (var data2 = new GlbLowLevelParser(AliciaPath, bytes).Parse())