diff --git a/IPython/frontend/html/notebook/static/js/savewidget.js b/IPython/frontend/html/notebook/static/js/savewidget.js
index 796ac78..b20dafa 100644
--- a/IPython/frontend/html/notebook/static/js/savewidget.js
+++ b/IPython/frontend/html/notebook/static/js/savewidget.js
@@ -138,6 +138,9 @@ var IPython = (function (IPython) {
     }
 
     SaveWidget.prototype.set_last_checkpoint = function (checkpoint) {
+        if (!checkpoint) {
+            this.set_checkpoint_status("");
+        }
         var d = new Date(checkpoint.last_modified);
         this.set_checkpoint_status(
             "Last Checkpoint: " + d.format('mmm dd HH:MM')