diff --git a/js/manage_tables.js b/js/manage_tables.js
index eb6baf176..a0530f570 100644
--- a/js/manage_tables.js
+++ b/js/manage_tables.js
@@ -276,7 +276,7 @@ function update_sortable_table()
 function get_table_row(id) {
 	id = id || $("input[name='sale_id']").val();
 	var $element = $("#sortable_table tbody :checkbox[value='" + id + "']");
-	if ($element.index() === -1) {
+	if ($element.length === 0) {
 		$element = $("#sortable_table tbody a[href*='" + id + "']");
 	}
 	return $element;