Index: grade/grading/form/rubric/backup/moodle2/restore_gradingform_rubric_plugin.class.php
===================================================================
--- grade/grading/form/rubric/backup/moodle2/restore_gradingform_rubric_plugin.class.php	(revision 69f8f7a6ba6421495b6e8beacec37e133dd4fefc)
+++ grade/grading/form/rubric/backup/moodle2/restore_gradingform_rubric_plugin.class.php	(revision )
@@ -109,6 +109,8 @@
         $data->criterionid = $this->get_mappingid('gradingform_rubric_criterion', $data->criterionid);
         $data->levelid = $this->get_mappingid('gradingform_rubric_level', $data->levelid);
 
+        if (!empty($data->criterionid)) {
-        $DB->insert_record('gradingform_rubric_fillings', $data);
+            $DB->insert_record('gradingform_rubric_fillings', $data);
+        }
     }
 }