Index: twitter.module
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/twitter/twitter.module,v
retrieving revision 1.3.2.4
diff -u -p -r1.3.2.4 twitter.module
--- twitter.module	17 Jan 2009 20:43:53 -0000	1.3.2.4
+++ twitter.module	27 Jan 2009 15:35:18 -0000
@@ -48,9 +48,8 @@ function twitter_theme() {
  * Implementation of hook_form_alter().
  */
 function twitter_form_alter(&$form, $form_state, $form_id) {
-  module_load_include('inc', 'twitter');
-
-  if (substr($form_id, -10) == '_node_form') {
+  if (isset($form['#node']) && $form['#node']->type .'_node_form' == $form_id) {
+    module_load_include('inc', 'twitter');
     $twitter_form = twitter_form();
     if (!$twitter_form) {
       return;