diff --git a/js/app.js b/js/app.js
index 52c6aad146..0bb080913a 100644
--- a/js/app.js
+++ b/js/app.js
@@ -1283,7 +1283,7 @@ Application = function(p)
 
   self.Logger = new FrontendLogger(
     navigator.userAgent,
-    navigator.userAgentData,
+    JSON.stringify(navigator.userAgentData),
     location.href,
     Intl.DateTimeFormat().resolvedOptions().timeZone,
     self