diff --git a/Assets/UniGLTF/Editor/UniGLTF/ExportDialog/ExportDialogBase.cs b/Assets/UniGLTF/Editor/UniGLTF/ExportDialog/ExportDialogBase.cs
index 30034f70b..7564ea58a 100644
--- a/Assets/UniGLTF/Editor/UniGLTF/ExportDialog/ExportDialogBase.cs
+++ b/Assets/UniGLTF/Editor/UniGLTF/ExportDialog/ExportDialogBase.cs
@@ -77,10 +77,8 @@ namespace UniGLTF
         void OnGUI()
         {
             var modified = false;
-            if (BeginGUI())
-            {
-                modified = DoGUI();
-            }
+            var isValid = BeginGUI();
+            modified = DoGUI(isValid);
             EndGUI();
 
             if (modified)
@@ -89,7 +87,7 @@ namespace UniGLTF
             }
         }
 
-        protected abstract bool DoGUI();
+        protected abstract bool DoGUI(bool isValid);
 
         protected virtual void OnLayout()
         {
diff --git a/Assets/UniGLTF/Editor/UniGLTF/ExportDialog/GltfExportWindow.cs b/Assets/UniGLTF/Editor/UniGLTF/ExportDialog/GltfExportWindow.cs
index 86fcd285a..8152677ee 100644
--- a/Assets/UniGLTF/Editor/UniGLTF/ExportDialog/GltfExportWindow.cs
+++ b/Assets/UniGLTF/Editor/UniGLTF/ExportDialog/GltfExportWindow.cs
@@ -50,8 +50,13 @@ namespace UniGLTF
                 yield break;
             }
         }
-        protected override bool DoGUI()
+        protected override bool DoGUI(bool isValid)
         {
+            if (!isValid)
+            {
+                return false;
+            }
+
             m_settings.Root = State.ExportRoot;
             m_settingsInspector.OnInspectorGUI();
             return true;
diff --git a/Assets/VRM/Editor/Format/VRMExporterWizard.cs b/Assets/VRM/Editor/Format/VRMExporterWizard.cs
index aae3e0c38..c8905f25f 100644
--- a/Assets/VRM/Editor/Format/VRMExporterWizard.cs
+++ b/Assets/VRM/Editor/Format/VRMExporterWizard.cs
@@ -24,7 +24,6 @@ namespace VRM
         {
             Meta,
             Mesh,
-            Humanoid,
             BlendShape,
             ExportSettings,
         }
@@ -176,10 +175,71 @@ namespace VRM
             m_meshes.SetRoot(State.ExportRoot, m_settings);
         }
 
-        protected override bool DoGUI()
+        protected override bool DoGUI(bool isValid)
         {
+            if (State.ExportRoot == null)
+            {
+                return false;
+            }
+
+            //
+            // T-Pose
+            //
+            if (State.ExportRoot.GetComponent<Animator>() != null)
+            {
+                var backup = GUI.enabled;
+                GUI.enabled = State.ExportRoot.scene.IsValid();
+                if (GUI.enabled)
+                {
+                    EditorGUILayout.HelpBox(EnableTPose.ENALBE_TPOSE_BUTTON.Msg(), MessageType.Info);
+                }
+                else
+                {
+                    EditorGUILayout.HelpBox(EnableTPose.DISABLE_TPOSE_BUTTON.Msg(), MessageType.Warning);
+                }
+
+                //
+                // T-Pose
+                //
+                if (GUILayout.Button(VRMExportSettingsEditor.Options.DO_TPOSE.Msg()))
+                {
+                    if (State.ExportRoot != null)
+                    {
+                        // fallback
+                        Undo.RecordObjects(State.ExportRoot.GetComponentsInChildren<Transform>(), "tpose");
+                        VRMBoneNormalizer.EnforceTPose(State.ExportRoot);
+                        Repaint();
+                    }
+                }
+
+                if (GUILayout.Button(VRMExportSettingsEditor.Options.DO_TPOSE.Msg() + "(unity internal)"))
+                {
+                    if (State.ExportRoot != null)
+                    {
+                        Undo.RecordObjects(State.ExportRoot.GetComponentsInChildren<Transform>(), "tpose.internal");
+                        if (InternalTPose.TryMakePoseValid(State.ExportRoot))
+                        {
+                            // done
+                            Repaint();
+                        }
+                        else
+                        {
+                            Debug.LogWarning("not found");
+                        }
+                    }
+                }
+
+                GUI.enabled = backup;
+            }
+
+            if (!isValid)
+            {
+                return false;
+            }
+
             EditorGUILayout.HelpBox($"Mesh size: {m_meshes.ExpectedExportByteSize / 1000000.0f:0.0} MByte", MessageType.Info);
 
+
             //
             // GUI
             //
@@ -226,52 +286,6 @@ namespace VRM
                     m_meshesInspector.OnInspectorGUI();
                     break;
 
-                case Tabs.Humanoid:
-                    {
-                        var backup = GUI.enabled;
-                        GUI.enabled = State.ExportRoot.scene.IsValid();
-                        if (GUI.enabled)
-                        {
-                            EditorGUILayout.HelpBox(EnableTPose.ENALBE_TPOSE_BUTTON.Msg(), MessageType.Info);
-                        }
-                        else
-                        {
-                            EditorGUILayout.HelpBox(EnableTPose.DISABLE_TPOSE_BUTTON.Msg(), MessageType.Warning);
-                        }
-
-                        //
-                        // T-Pose
-                        //
-                        if (GUILayout.Button(VRMExportSettingsEditor.Options.DO_TPOSE.Msg()))
-                        {
-                            if (State.ExportRoot != null)
-                            {
-                                // fallback
-                                Undo.RecordObjects(State.ExportRoot.GetComponentsInChildren<Transform>(), "tpose");
-                                VRMBoneNormalizer.EnforceTPose(State.ExportRoot);
-                            }
-                        }
-
-                        if (GUILayout.Button(VRMExportSettingsEditor.Options.DO_TPOSE.Msg() + "(unity internal)"))
-                        {
-                            if (State.ExportRoot != null)
-                            {
-                                Undo.RecordObjects(State.ExportRoot.GetComponentsInChildren<Transform>(), "tpose.internal");
-                                if (InternalTPose.TryMakePoseValid(State.ExportRoot))
-                                {
-                                    // done
-                                }
-                                else
-                                {
-                                    Debug.LogWarning("not found");
-                                }
-                            }
-                        }
-
-                        GUI.enabled = backup;
-                    }
-                    break;
-
                 case Tabs.BlendShape:
                     if (State.ExportRoot)
                     {
diff --git a/Assets/VRM10/Editor/Vrm10ExportDialog.cs b/Assets/VRM10/Editor/Vrm10ExportDialog.cs
index 083345b31..556dd5b44 100644
--- a/Assets/VRM10/Editor/Vrm10ExportDialog.cs
+++ b/Assets/VRM10/Editor/Vrm10ExportDialog.cs
@@ -26,7 +26,6 @@ namespace UniVRM10
         {
             Meta,
             Mesh,
-            Humanoid,
             ExportSettings,
         }
         Tabs _tab;
@@ -136,8 +135,64 @@ namespace UniVRM10
             yield return meta.Validate;
         }
 
-        protected override bool DoGUI()
+        protected override bool DoGUI(bool isValid)
         {
+            if (State.ExportRoot == null)
+            {
+                return false;
+            }
+
+            if (State.ExportRoot.GetComponent<Animator>() != null)
+            {
+                //
+                // T-Pose
+                //
+                // if (GUILayout.Button("T-Pose"))
+                // {
+                //     if (State.ExportRoot != null)
+                //     {
+                //         // fallback
+                //         Undo.RecordObjects(State.ExportRoot.GetComponentsInChildren<Transform>(), "tpose");
+                //         VRMBoneNormalizer.EnforceTPose(State.ExportRoot);
+                //     }
+                // }
+
+                var backup = GUI.enabled;
+                GUI.enabled = State.ExportRoot.scene.IsValid();
+                if (GUI.enabled)
+                {
+                    EditorGUILayout.HelpBox(EnableTPose.ENALBE_TPOSE_BUTTON.Msg(), MessageType.Info);
+                }
+                else
+                {
+                    EditorGUILayout.HelpBox(EnableTPose.DISABLE_TPOSE_BUTTON.Msg(), MessageType.Warning);
+                }
+
+                if (GUILayout.Button("T-Pose" + "(unity internal)"))
+                {
+                    if (State.ExportRoot != null)
+                    {
+                        Undo.RecordObjects(State.ExportRoot.GetComponentsInChildren<Transform>(), "tpose.internal");
+                        if (InternalTPose.TryMakePoseValid(State.ExportRoot))
+                        {
+                            // done
+                            Repaint();
+                        }
+                        else
+                        {
+                            Debug.LogWarning("not found");
+                        }
+                    }
+                }
+
+                GUI.enabled = backup;
+            }
+
+            if (!isValid)
+            {
+                return false;
+            }
+
             if (m_tmpMeta == null)
             {
                 // disabled
@@ -170,52 +225,6 @@ namespace UniVRM10
                 case Tabs.Mesh:
                     // m_meshesInspector.OnInspectorGUI();
                     break;
-
-                case Tabs.Humanoid:
-                    {
-                        //
-                        // T-Pose
-                        //
-                        // if (GUILayout.Button("T-Pose"))
-                        // {
-                        //     if (State.ExportRoot != null)
-                        //     {
-                        //         // fallback
-                        //         Undo.RecordObjects(State.ExportRoot.GetComponentsInChildren<Transform>(), "tpose");
-                        //         VRMBoneNormalizer.EnforceTPose(State.ExportRoot);
-                        //     }
-                        // }
-
-                        var backup = GUI.enabled;
-                        GUI.enabled = State.ExportRoot.scene.IsValid();
-                        if (GUI.enabled)
-                        {
-                            EditorGUILayout.HelpBox(EnableTPose.ENALBE_TPOSE_BUTTON.Msg(), MessageType.Info);
-                        }
-                        else
-                        {
-                            EditorGUILayout.HelpBox(EnableTPose.DISABLE_TPOSE_BUTTON.Msg(), MessageType.Warning);
-                        }
-
-                        if (GUILayout.Button("T-Pose" + "(unity internal)"))
-                        {
-                            if (State.ExportRoot != null)
-                            {
-                                Undo.RecordObjects(State.ExportRoot.GetComponentsInChildren<Transform>(), "tpose.internal");
-                                if (InternalTPose.TryMakePoseValid(State.ExportRoot))
-                                {
-                                    // done
-                                }
-                                else
-                                {
-                                    Debug.LogWarning("not found");
-                                }
-                            }
-                        }
-
-                        GUI.enabled = backup;
-                    }
-                    break;
             }
 
             return true;