=== modified file 'sites/all/modules/hierarchical_select/hierarchical_select.module'
--- sites/all/modules/hierarchical_select/hierarchical_select.module	2010-04-17 22:40:03 +0000
+++ sites/all/modules/hierarchical_select/hierarchical_select.module	2010-04-18 00:57:58 +0000
@@ -1821,7 +1821,7 @@
         $hierarchy->levels[$depth] = array('create_new_item' => $option) + $hierarchy->levels[$depth];
       }
       // Level label: set an empty level label if they've been disabled.
-      $label = ($config['level_labels']['status']) ? t($config['level_labels']['labels'][$depth]) : '';
+      $label = ($config['level_labels']['status'] && isset($config['level_labels']['labels'][$depth])) ? t($config['level_labels']['labels'][$depth]) : '';
       $hierarchy->levels[$depth] = array('label_'. $depth => $label) + $hierarchy->levels[$depth];
     }