diff --git a/lib/grade/grade_object.php b/lib/grade/grade_object.php
index 97a7114a91d..3b6f2025688 100644
--- a/lib/grade/grade_object.php
+++ b/lib/grade/grade_object.php
@@ -132,7 +132,7 @@ abstract class grade_object {
         if ($instances = grade_object::fetch_all_helper($table, $classname, $params)) {
             if (count($instances) > 1) {
                 // we should not tolerate any errors here - problems might appear later
-                print_error('morethanonerecordinfetch');
+                print_error('morethanonerecordinfetch','debug');
             }
             return reset($instances);
         } else {