diff --git a/Assets/VRM10/Runtime/IO/ModelExtensions.cs b/Assets/VRM10/Runtime/IO/ModelExtensions.cs
index b88227440..7037dfe71 100644
--- a/Assets/VRM10/Runtime/IO/ModelExtensions.cs
+++ b/Assets/VRM10/Runtime/IO/ModelExtensions.cs
@@ -6,7 +6,7 @@ namespace UniVRM10
 {
     public static class ModelExtensions
     {
-        public static byte[] ToGlb(this VrmLib.Model model, Func<Texture2D, (byte[], string)> getTextureBytes)
+        public static byte[] ToGlb(this VrmLib.Model model, GameObject root, RuntimeVrmConverter converter, Func<Texture2D, (byte[], string)> getTextureBytes)
         {
             // export vrm-1.0
             var exporter10 = new Vrm10Exporter(_ => false);
@@ -14,7 +14,8 @@ namespace UniVRM10
             {
                 // vrm = false
             };
-            exporter10.Export(null, model, null, option, getTextureBytes);
+
+            exporter10.Export(root, model, converter, option, getTextureBytes);
             var glb10 = UniGLTF.Glb.Parse(exporter10.Storage.ToBytes());
             return glb10.ToBytes();
         }
diff --git a/Assets/VRM10/Runtime/IO/Vrm10Exporter.cs b/Assets/VRM10/Runtime/IO/Vrm10Exporter.cs
index 89f22b7f2..dbefca5ab 100644
--- a/Assets/VRM10/Runtime/IO/Vrm10Exporter.cs
+++ b/Assets/VRM10/Runtime/IO/Vrm10Exporter.cs
@@ -200,7 +200,7 @@ namespace UniVRM10
 
         (UniGLTF.Extensions.VRMC_vrm.VRMC_vrm vrm, UniGLTF.Extensions.VRMC_springBone.VRMC_springBone springBone, int? thumbnailIndex) ExportVrm(GameObject root, Model model, RuntimeVrmConverter converter, VRM10MetaObject meta)
         {
-            var vrmController = root.GetComponent<VRM10Controller>();
+            var vrmController = root?.GetComponent<VRM10Controller>();
 
             if (meta == null)
             {
diff --git a/Assets/VRM10/Runtime/Scenes/Sample.cs b/Assets/VRM10/Runtime/Scenes/Sample.cs
index 927aed4b1..959b936f3 100644
--- a/Assets/VRM10/Runtime/Scenes/Sample.cs
+++ b/Assets/VRM10/Runtime/Scenes/Sample.cs
@@ -35,7 +35,7 @@ public class Sample : MonoBehaviour
         var model = exporter.ToModelFrom10(vrm0x);
         // 右手系に変換
         model.ConvertCoordinate(VrmLib.Coordinates.Vrm1);
-        var exportedBytes = model.ToGlb(TextureExporter.GetTextureBytesWithMime);
+        var exportedBytes = model.ToGlb(vrm0x, exporter, TextureExporter.GetTextureBytesWithMime);
 
         // Import 1.0
         var vrm10 = Import(exportedBytes, src);
diff --git a/Assets/VRM10/Tests/ApiSampleTests.cs b/Assets/VRM10/Tests/ApiSampleTests.cs
index ed8dba284..1305956ba 100644
--- a/Assets/VRM10/Tests/ApiSampleTests.cs
+++ b/Assets/VRM10/Tests/ApiSampleTests.cs
@@ -35,18 +35,11 @@ namespace UniVRM10.Test
             }
         }
 
-        VrmLib.Model ToModel(UnityEngine.GameObject target)
-        {
-            var exporter = new UniVRM10.RuntimeVrmConverter();
-            var model = exporter.ToModelFrom10(target);
-            return model;
-        }
-
-        byte[] ToVrm10(VrmLib.Model model)
+        byte[] ToVrm10(GameObject root, RuntimeVrmConverter converter, VrmLib.Model model)
         {
             // 右手系に変換
             VrmLib.ModelExtensionsForCoordinates.ConvertCoordinate(model, VrmLib.Coordinates.Vrm1);
-            var bytes = UniVRM10.ModelExtensions.ToGlb(model, AssetTextureUtil.GetTextureBytesWithMime);
+            var bytes = UniVRM10.ModelExtensions.ToGlb(model, root, converter, AssetTextureUtil.GetTextureBytesWithMime);
             return bytes;
         }
 
@@ -61,14 +54,18 @@ namespace UniVRM10.Test
             var parser = new GltfParser();
             parser.Parse(path, migrated);
 
-            var asset = BuildGameObject(parser, true);
-            Debug.Log(asset);
+            var go = BuildGameObject(parser, true);
+            Debug.Log(go);
 
             // export
-            var dstModel = ToModel(asset);
+            // var dstModel = ToModel(go);
+            var exporter = new UniVRM10.RuntimeVrmConverter();
+            var dstModel = exporter.ToModelFrom10(go);
+            // return model;
+
             Debug.Log(dstModel);
 
-            var vrmBytes = ToVrm10(dstModel);
+            var vrmBytes = ToVrm10(go, exporter, dstModel);
             Debug.Log($"export {vrmBytes.Length} bytes");
         }
     }