diff --git a/preferences/preferences.php b/preferences/preferences.php
index 2065726d58..d047b860c4 100755
--- a/preferences/preferences.php
+++ b/preferences/preferences.php
@@ -154,7 +154,7 @@
 
 		while (is_array($array) && list($var,$value) = each($array))
 		{
-			if ($value && $value != '**NULL**')
+			if (isset($value) && $value != '' && $value != '**NULL**')
 			{
 				$_p->add($_appname,$var,$value);
 			}