fix

booking.studygroup_leaders.inc

@@ -420,7 +420,7 @@ function booking_studygroup_leadhelp_edit_form_submit($form, &$form_state) {
 						))
 						->condition('booking_studygroup_id', $group_id)
 						->condition('booking_node_id', $previous_value)
-						->execute()
+						->execute();
 					$counter++;
 				}
 			}