diff --git a/Assets/VRM10/Runtime/IO/Vrm10Exporter.cs b/Assets/VRM10/Runtime/IO/Vrm10Exporter.cs
index 1e154dffb..c0561cb56 100644
--- a/Assets/VRM10/Runtime/IO/Vrm10Exporter.cs
+++ b/Assets/VRM10/Runtime/IO/Vrm10Exporter.cs
@@ -284,6 +284,10 @@ namespace UniVRM10
 
         public void ExportVrmExpression(ExpressionManager src, List<MeshGroup> _, List<Material> materials, List<Node> nodes)
         {
+            if (Storage.gltfVrm.Expressions == null)
+            {
+                Storage.gltfVrm.Expressions = new List<UniGLTF.Extensions.VRMC_vrm.Expression>();
+            }
             foreach (var x in src.ExpressionList)
             {
                 Storage.gltfVrm.Expressions.Add(x.ToGltf(nodes, materials));
diff --git a/Assets/VRM10/Runtime/IO/VrmExpressionAdapter.cs b/Assets/VRM10/Runtime/IO/VrmExpressionAdapter.cs
index b03d9057b..c4d30c371 100644
--- a/Assets/VRM10/Runtime/IO/VrmExpressionAdapter.cs
+++ b/Assets/VRM10/Runtime/IO/VrmExpressionAdapter.cs
@@ -116,18 +116,25 @@ namespace UniVRM10
                 OverrideLookAt = EnumUtil.Cast<UniGLTF.Extensions.VRMC_vrm.ExpressionOverrideType>(x.OverrideLookAt),
                 OverrideMouth = EnumUtil.Cast<UniGLTF.Extensions.VRMC_vrm.ExpressionOverrideType>(x.OverrideMouth),
             };
+
+            g.MorphTargetBinds = new List<UniGLTF.Extensions.VRMC_vrm.MorphTargetBind>();
             foreach (var blendShapeBind in x.MorphTargetBinds)
             {
                 g.MorphTargetBinds.Add(blendShapeBind.ToGltf(nodes));
             }
+
+            g.MaterialColorBinds = new List<UniGLTF.Extensions.VRMC_vrm.MaterialColorBind>();
             foreach (var materialColorBind in x.MaterialColorBinds)
             {
                 g.MaterialColorBinds.Add(materialColorBind.ToGltf(materials));
             }
+
+            g.TextureTransformBinds = new List<UniGLTF.Extensions.VRMC_vrm.TextureTransformBind>();
             foreach (var materialUVBind in x.TextureTransformBinds)
             {
                 g.TextureTransformBinds.Add(materialUVBind.ToGltf(materials));
             }
+
             return g;
         }