diff --git a/Assets/VRM/UniGLTF/Editor/Serialization/SerializerGenerator.cs b/Assets/VRM/UniGLTF/Editor/Serialization/SerializerGenerator.cs
index a1d1c0130..783afcec8 100644
--- a/Assets/VRM/UniGLTF/Editor/Serialization/SerializerGenerator.cs
+++ b/Assets/VRM/UniGLTF/Editor/Serialization/SerializerGenerator.cs
@@ -59,6 +59,9 @@ namespace UniGLTF
                 {"gltf/accessors[]/max", "if(value.max!=null && value.max.Length>0)"},
                 {"gltf/accessors[]/min", "if(value.min!=null && value.min.Length>0)"},
                 {"gltf/accessors[]/sparse", "if(value.sparse!=null && value.sparse.count>0)"},
+                {"gltf/accessors[]/bufferView", "if(value.bufferView>=0)"},
+                {"gltf/accessors[]/byteOffset", "if(value.bufferView>=0)"},
+
                 {"gltf/images", "if(value.images!=null && value.images.Count>0)" },
 
                 {"gltf/meshes", "if(value.meshes!=null && value.meshes.Count>0)" },
diff --git a/Assets/VRM/UniGLTF/Scripts/IO/FormatterExtensionsGltf.g.cs b/Assets/VRM/UniGLTF/Scripts/IO/FormatterExtensionsGltf.g.cs
index 11bdaf98d..7bd0d6a47 100644
--- a/Assets/VRM/UniGLTF/Scripts/IO/FormatterExtensionsGltf.g.cs
+++ b/Assets/VRM/UniGLTF/Scripts/IO/FormatterExtensionsGltf.g.cs
@@ -246,12 +246,12 @@ namespace UniGLTF {
     {
         f.BeginMap(0); // dummy
 
-        
+        if(value.bufferView>=0)
         {
             f.Key("bufferView"); f.GenSerialize(value.bufferView);
         }
 
-        
+        if(value.bufferView>=0)
         {
             f.Key("byteOffset"); f.GenSerialize(value.byteOffset);
         }