diff --git a/phpgwapi/inc/class.preferences.inc.php b/phpgwapi/inc/class.preferences.inc.php
index 4f71152ef6..b27a05a552 100644
--- a/phpgwapi/inc/class.preferences.inc.php
+++ b/phpgwapi/inc/class.preferences.inc.php
@@ -394,7 +394,7 @@
 				}
 				else
 				{
-					if ($var && isset($this->$set_from[$app_name][$var]) && $this->$set_from[$app_name][$var] !== '')
+					if ($var && @isset($this->$set_from[$app_name][$var]) && $this->$set_from[$app_name][$var] !== '')
 					{
 						$this->data[$app_name][$var] = $this->$set_from[$app_name][$var];
 						break;