--- a/authors.php
+++ b/authors.php
@@ -21,11 +21,11 @@
 // To read the license please visit http://www.gnu.org/copyleft/gpl.html

 // ----------------------------------------------------------------------

 

-if($_GET['action'] == "list") {

+if(isset($_GET['action']) && $_GET['action'] == "list") {

 	$current = "members";

 	$list = "members";

 }

-else if($_GET["list"] == "authors") $current = "authors";

+else if(isset($_GET['list']) && $_GET["list"] == "authors") $current = "authors";

 else $current = "members";

 

 include ("header.php");