diff --git a/sites/all/modules/contrib/registration/includes/registration.forms.inc b/sites/all/modules/contrib/registration/includes/registration.forms.inc
index 1c4cffa..0f6a9f8 100644
--- a/sites/all/modules/contrib/registration/includes/registration.forms.inc
+++ b/sites/all/modules/contrib/registration/includes/registration.forms.inc
@@ -23,7 +23,7 @@ function registration_form($form, &$form_state, Registration $registration) {
 
   $settings = registration_entity_settings($registration->entity_type, $registration->entity_id);
 
-  if (!registration_has_room($registration->entity_type, $registration->entity_id)) {
+  if (!registration_has_room($registration->entity_type, $registration->entity_id) && module_exists('registration_waitlist')) {
     if ($settings['settings']['registration_waitlist_enable'] == 1 && $settings['settings']['registration_waitlist_message_enable'] == 1) {
       drupal_set_message(t($settings['settings']['registration_waitlist_message']), 'warning');
     }