--- book.module.orig	2005-10-17 09:50:31.000000000 -0700
+++ book.module	2005-10-17 09:50:21.000000000 -0700
@@ -55,7 +55,7 @@
 
   $links = array();
 
-  if ($type == 'node' && isset($node->parent)) {
+  if ($type == 'node' && $node->type == 'book' && isset($node->parent)) {
     if (!$main) {
       if (book_access('create', $node)) {
         $links[] = l(t('add child page'), "node/add/book/parent/$node->nid");