diff --git a/Assets/VRM10.Samples/Runtime/ViewerUI.cs b/Assets/VRM10.Samples/Runtime/ViewerUI.cs
index 27ef876a5..7847b2df6 100644
--- a/Assets/VRM10.Samples/Runtime/ViewerUI.cs
+++ b/Assets/VRM10.Samples/Runtime/ViewerUI.cs
@@ -95,8 +95,10 @@ namespace UniVRM10.Samples
                 m_textModelVersion.text = meta.Version;
                 m_textModelAuthor.text = meta.Authors[0];
                 m_textModelContact.text = meta.ContactInformation;
-                m_textModelReference.text = meta.References[0];
-
+                if (meta.References != null && meta.References.Count > 0)
+                {
+                    m_textModelReference.text = meta.References[0];
+                }
                 m_textPermissionAllowed.text = meta.AllowedUser.ToString();
                 m_textPermissionViolent.text = meta.ViolentUsage.ToString();
                 m_textPermissionSexual.text = meta.SexualUsage.ToString();