diff --git a/src/backends/test-repo/implementation.js b/src/backends/test-repo/implementation.js
index 945296b921fa..319426e28bbe 100644
--- a/src/backends/test-repo/implementation.js
+++ b/src/backends/test-repo/implementation.js
@@ -34,7 +34,7 @@ const getCursor = (collection, extension, entries, index) => {
 };
 
 const getFolderEntries = (folder, extension) => {
-  return Object.keys(window.repoFiles[folder])
+  return Object.keys(window.repoFiles[folder] || {})
     .filter(path => path.endsWith(`.${ extension }`))
     .map(path => ({
       file: { path: `${ folder }/${ path }` },