diff --git a/booking.studygroup_leaders.inc b/booking.studygroup_leaders.inc
index 547a17f..9558ea8 100644
--- a/booking.studygroup_leaders.inc
+++ b/booking.studygroup_leaders.inc
@@ -423,6 +423,7 @@ function booking_studygroup_leadhelp_edit_form_submit($form, &$form_state) {
 							))
 							->condition('booking_studygroup_id', $group_id)
 							->condition('booking_node_id', $previous_value)
+							->condition('booking_session_id', $session_id)
 							->execute();
 						$counter++;
 					}	//end previous value check