diff --git a/backup/moodle2/restore_qtype_plugin.class.php b/backup/moodle2/restore_qtype_plugin.class.php
index 60f599a38b9..7520aa31910 100644
--- a/backup/moodle2/restore_qtype_plugin.class.php
+++ b/backup/moodle2/restore_qtype_plugin.class.php
@@ -181,7 +181,7 @@ abstract class restore_qtype_plugin extends restore_plugin {
                 $info = new stdClass();
                 $info->filequestionid = $oldquestionid;
                 $info->dbquestionid   = $newquestionid;
-                $info->answer         = $data->answertext;
+                $info->answer         = s($data->answertext);
                 throw new restore_step_exception('error_question_answers_missing_in_db', $info);
             }
             $newitemid = $this->questionanswercache[$data->answertext];
diff --git a/lang/en/error.php b/lang/en/error.php
index 6e8f4157386..93db2e57ee6 100644
--- a/lang/en/error.php
+++ b/lang/en/error.php
@@ -224,6 +224,7 @@ $string['duplicateroleshortname'] = 'There is already a role with this short nam
 $string['duplicateusername'] = 'Duplicate username - skipping record';
 $string['emailfail'] = 'Emailing failed';
 $string['error'] = 'Error occurred';
+$string['error_question_answers_missing_in_db'] = 'Failed to find an answer matching "{$a->answer}" in the question_answers database table. This occurred while restoring the question with id {$a->filequestionid} in the backup file, which has been matched to the existing question with id {$a->dbquestionid} in the database.';
 $string['errorprocessingarchive'] = 'Error processing archive file';
 $string['errorcleaningdirectory'] = 'Error cleaning directory "{$a}"';
 $string['errorcopyingfiles'] = 'Error copying files';