diff --git a/mozilla/browser/components/bookmarks/content/bookmarks.js b/mozilla/browser/components/bookmarks/content/bookmarks.js
index 3d958b567f6..e743c8a090b 100644
--- a/mozilla/browser/components/bookmarks/content/bookmarks.js
+++ b/mozilla/browser/components/bookmarks/content/bookmarks.js
@@ -190,6 +190,11 @@ var BookmarksCommand = {
   // selection.
   createContextMenu: function (aEvent, aSelection, aDS)
   {
+    if (aSelection == undefined) {
+      aEvent.preventDefault();
+      return;
+    }
+
     var popup = aEvent.target;
     // clear out the old context menu contents (if any)
     while (popup.hasChildNodes())