diff --git a/modules/ui/undo_redo.js b/modules/ui/undo_redo.js
index d3f0a3df7..7ec94ae56 100644
--- a/modules/ui/undo_redo.js
+++ b/modules/ui/undo_redo.js
@@ -29,7 +29,8 @@ export function uiUndoRedo(context) {
 
 
     function editable() {
-        return context.editable() && context.mode().id !== 'save';
+        var mode = context.mode();
+        return context.editable() && mode && mode.id !== 'save';
     }