diff --git a/booking.variety_form.inc b/booking.variety_form.inc
index ef564cf..f31e0b2 100644
--- a/booking.variety_form.inc
+++ b/booking.variety_form.inc
@@ -162,8 +162,11 @@ function booking_variety_regn_form_validate($form, &$form_state) {
   foreach ($variety_timeslot_ids as $id) {
     $selected_session_id = $values['select-variety-' . $id];
 
-    if ($sessions[$selected_session_id]->booking_variety_regncount < $sessions[$selected_session_id]->booking_variety_maxsize) {
-      watchdog('booking_debug', 'Still room in session ' . $selected_session_id);
+    if ($sessions[$selected_session_id]['booking_variety_regncount'] < $sessions[$selected_session_id]['booking_variety_maxsize']) {
+      watchdog('booking_debug', 'Still room in session @id : @count is less than @size', array(
+        '@id' => $selected_session_id, '@count' => $sessions[$selected_session_id]['booking_variety_regncount'],
+        '@size' => $sessions[$selected_session_id]['booking_variety_maxsize']
+      ));
     }
   }