Index: mailman_groups.module
===================================================================
--- mailman_groups.module	(Revision 3157)
+++ mailman_groups.module	(Arbeitskopie)
@@ -398,7 +398,7 @@ function _mailman_groups_alter_user_prof
 
 // The User Registration form will show any Lists set for "anonymous" access, so we need to process that form too.
 function _mailman_groups_alter_user_register(&$form, $form_state)  {
-  return _mailman_groups_alter_user_profile_form(&$form, $form_state);
+  return _mailman_groups_alter_user_profile_form($form, $form_state);
 }