diff --git a/element/date/classes/element.php b/element/date/classes/element.php
index 265b244..272f663 100644
--- a/element/date/classes/element.php
+++ b/element/date/classes/element.php
@@ -220,7 +220,7 @@ class element extends \mod_customcert\element {
         $dateinfo = json_decode($this->get_data());
         if ($newitem = \restore_dbops::get_backup_ids_record($restore->get_restoreid(), 'course_module', $dateinfo->dateitem)) {
             $dateinfo->dateitem = $newitem->newitemid;
-            $DB->set_field('customcert_elements', 'data', self::save_unique_data($dateinfo), array('id' => $this->get_id()));
+            $DB->set_field('customcert_elements', 'data', $this->save_unique_data($dateinfo), array('id' => $this->get_id()));
         }
     }
 
diff --git a/element/grade/classes/element.php b/element/grade/classes/element.php
index 8ae807c..286b204 100644
--- a/element/grade/classes/element.php
+++ b/element/grade/classes/element.php
@@ -181,7 +181,7 @@ class element extends \mod_customcert\element {
         $gradeinfo = json_decode($this->get_data());
         if ($newitem = \restore_dbops::get_backup_ids_record($restore->get_restoreid(), 'course_module', $gradeinfo->gradeitem)) {
             $gradeinfo->gradeitem = $newitem->newitemid;
-            $DB->set_field('customcert_elements', 'data', self::save_unique_data($gradeinfo), array('id' => $this->get_id()));
+            $DB->set_field('customcert_elements', 'data', $this->save_unique_data($gradeinfo), array('id' => $this->get_id()));
         }
     }