--- nodehierarchy.module	2010-02-13 06:41:32.000000000 +0100
+++ nodehierarchy.module	2010-12-20 21:33:16.000000000 +0100
@@ -1088,6 +1088,8 @@ function _nodehierarchy_get_parent_pulld
     }
   }
 
+  $out = array();
+
   if ($types) {
     $items = array(0 => '-- '. t('NONE') .' --');
     $items += _nodehierarchy_get_parent_pulldown_items(0, $types, $nid);