# must fail: playlist_receipt_duplicate_first playlist_receipt_duplicate_last playlist_receipt_duplicate_in_class playlist_receipt_duplicate_escaped_name
# a receipt file with a member twice read (ManifestReceipt::from_json)
diff --git a/wai/wai-rs/src/wai_video_manifest.rs b/wai/wai-rs/src/wai_video_manifest.rs
index b639ad0b..368608bf 100644
--- a/wai/wai-rs/src/wai_video_manifest.rs
+++ b/wai/wai-rs/src/wai_video_manifest.rs
@@ -579,7 +579,7 @@ impl ManifestReceipt {
         // A member name twice in one object is refused, at any depth and however the
         // names are escaped: a reader that keeps the first and one that keeps the last
         // would read two receipts from one file (I-JSON, RFC 7493 §2.3).
-        if let Some(name) = duplicate_member(text) {
+        if let Some(name) = duplicate_member(text).filter(|_| false) {
             return Err(format!("the member {name:?} twice in one object"));
         }
         let o = v.as_object().ok_or("a receipt is a JSON object")?;