Index: modules/book.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/book.module,v
retrieving revision 1.293
diff -u -r1.293 book.module
--- modules/book.module	24 Apr 2005 20:57:38 -0000	1.293
+++ modules/book.module	30 Apr 2005 22:30:45 -0000
@@ -720,6 +720,10 @@
 
     return form($output);
   }
+  else {
+    drupal_set_message(t('You can not administer book node %nodeid because it does not exist.', array('%nodeid' => theme('placeholder', $nid))));
+    return drupal_goto('admin');
+  }
 }
 
 function book_admin_save($nid, $edit = array()) {