diff --git a/polygerrit-ui/app/behaviors/gr-access-behavior/gr-access-behavior.html b/polygerrit-ui/app/behaviors/gr-access-behavior/gr-access-behavior.html
index e949a87..499970e 100644
--- a/polygerrit-ui/app/behaviors/gr-access-behavior/gr-access-behavior.html
+++ b/polygerrit-ui/app/behaviors/gr-access-behavior/gr-access-behavior.html
@@ -142,6 +142,7 @@
      *    object.
      */
     toSortedArray(obj) {
+      if (!obj) { return []; }
       return Object.keys(obj).map(key => {
         return {
           id: key,