From d68bdf9dc627d056fbcd8549d202419d96e83326 Mon Sep 17 00:00:00 2001
From: Raymond Zhou <56318341+rayzhou-bit@users.noreply.github.com>
Date: Thu, 27 Apr 2023 11:38:59 -0700
Subject: [PATCH] feat: page errors indefinitely with no ancestor (#321)

---
 src/editors/data/services/cms/urls.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/editors/data/services/cms/urls.js b/src/editors/data/services/cms/urls.js
index c8d2e0618..0a7de51fb 100644
--- a/src/editors/data/services/cms/urls.js
+++ b/src/editors/data/services/cms/urls.js
@@ -3,7 +3,7 @@ export const libraryV1 = ({ studioEndpointUrl, learningContextId }) => (
 );
 
 export const unit = ({ studioEndpointUrl, unitUrl }) => (
-  `${studioEndpointUrl}/container/${unitUrl.data.ancestors[0].id}`
+  `${studioEndpointUrl}/container/${unitUrl.data.ancestors[0]?.id}`
 );
 
 export const returnUrl = ({ studioEndpointUrl, unitUrl, learningContextId }) => {