diff --git a/src/server/index.html.js b/src/server/index.html.js
index edfe10d8f26a..bff4b4f9eb18 100644
--- a/src/server/index.html.js
+++ b/src/server/index.html.js
@@ -9,7 +9,7 @@ import { version } from '../../package.json';
 // [ 'static/manager.c6e6350b6eb01fff8bad.bundle.js',
 //   'static/manager.c6e6350b6eb01fff8bad.bundle.js.map' ]
 const managerUrlsFromAssets = (assets) => {
-  if (!assets) {
+  if (!assets || !assets.manager) {
     return {
       js: 'static/manager.bundle.js',
     };