From 344710b51da3455d325e67d5ec28e23a8f0e1c49 Mon Sep 17 00:00:00 2001
From: Mark Nelson <markn@moodle.com>
Date: Mon, 14 Dec 2015 11:10:50 +0800
Subject: [PATCH] Fixed issue when there are no teachers

---
 element/teachername/classes/element.php | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/element/teachername/classes/element.php b/element/teachername/classes/element.php
index bd49027..3dcffd6 100644
--- a/element/teachername/classes/element.php
+++ b/element/teachername/classes/element.php
@@ -48,7 +48,9 @@ class element extends \mod_customcert\element {
      * @return string the text
      */
     public function save_unique_data($data) {
-        return $data->teacher;
+        if (!empty($data->teacher)) {
+            return $data->teacher;
+        }
     }
 
     /**