Index: pathauto.module
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/pathauto/pathauto.module,v
retrieving revision 1.124
diff -u -r1.124 pathauto.module
--- pathauto.module	20 Apr 2009 22:52:37 -0000	1.124
+++ pathauto.module	8 May 2009 23:25:00 -0000
@@ -91,7 +91,7 @@
           if (module_exists('book') && !empty($object->book['menu_name'])) {
             for ($i = 1; $i < 10; $i++) {
               $second_child = $i + 2;
-              if ($object->book["p$second_child"] === 0) {
+              if ($object->book["p$second_child"] == 0) {
                 $parent_node = db_result(db_query('SELECT link_path FROM {menu_links} WHERE mlid = %d', $object->book["p$i"]));
                 break;
               }