diff --git a/www/common/sframe-common-outer.js b/www/common/sframe-common-outer.js
index a4b2606d4..25eadd544 100644
--- a/www/common/sframe-common-outer.js
+++ b/www/common/sframe-common-outer.js
@@ -162,7 +162,7 @@ define([
                     } catch (err) {
                         console.error(err, data);
                         if (data && data.error && data.error instanceof Error) {
-                            data.error = Util.serializeError(data.error);
+                            data.error = _Util.serializeError(data.error);
                             try {
                                 iframe.postMessage(data, '*');
                             } catch (err2) {