Index: comment_notify.module
===================================================================
--- comment_notify.module	(revision 42)
+++ comment_notify.module	(working copy)
@@ -75,7 +75,7 @@
   }
 
   // Only add the checkbox if this is an enabled content type
-  $node = node_load($form['nid']['#value']);
+  $node = node_load($form['nid']['#value'] ? $form['nid']['#value'] : $form['nid']['#default_value']);
   $enabled_types = variable_get('comment_notify_node_types', array($node->type => TRUE));
   if (empty($enabled_types[$node->type])) {
     return;