diff --git a/src/js/diff-updater.js b/src/js/diff-updater.js
index 87da6f4d6..ba91ddef3 100644
--- a/src/js/diff-updater.js
+++ b/src/js/diff-updater.js
@@ -194,6 +194,7 @@ async function fetchPatchDetailsFromCDNs(assetDetails) {
             console.error(reason);
         });
         if ( response === undefined ) { continue; }
+        if ( response.status === 404 ) { break; }
         if ( response.ok !== true ) { continue; }
         const patchText = await response.text();
         const patchDetails = parsePatch(patchText);