--- Element.old.php	2021-01-05 17:51:37.000000000 +0100
+++ Element.php	2022-02-02 15:30:25.588684634 +0100
@@ -143,7 +143,7 @@
         switch ($name) {
         case 'fs':
         case 'uri':
-            return $this->_data[$name];
+            return (isset($this->_data[$name])) ? $this->_data[$name] : null;
 
         case 'fulluri':
             return Horde::url($this->_data['uri'], true);