diff --git a/Assets/VRM/UniGLTF/Scripts/IO/MeshExporter.cs b/Assets/VRM/UniGLTF/Scripts/IO/MeshExporter.cs
index 73f1049a0..339e51748 100644
--- a/Assets/VRM/UniGLTF/Scripts/IO/MeshExporter.cs
+++ b/Assets/VRM/UniGLTF/Scripts/IO/MeshExporter.cs
@@ -262,11 +262,6 @@ namespace UniGLTF
                     }
 
                     // maybe skip
-
-                    blendShapeIndexMap.Add(j, exportBlendShapes++);
-
-                    // maybe skip
-
                     blendShapeIndexMap.Add(j, exportBlendShapes++);
 
                     //