diff --git a/include/common.php b/include/common.php
index d7a9692..90f078c 100644
--- a/include/common.php
+++ b/include/common.php
@@ -2,7 +2,7 @@
 
 umask(0007);
 
-if ($_SERVER['PHP_AUTH_USER'])
+if (isset($_SERVER['PHP_AUTH_USER']))
 	$PHPki_user = md5($_SERVER['PHP_AUTH_USER']);
 else
 	$PHPki_user = md5('default');
diff --git a/include/my_functions.php b/include/my_functions.php
index 138bc03..ee3f998 100644
--- a/include/my_functions.php
+++ b/include/my_functions.php
@@ -64,8 +64,8 @@ function upload($source, $destination, $content_type="application/octet-stream")
 function gpvar($v) {
 	global $_GET, $_POST;
     $x = "";
-	if ($_GET[$v])  $x = $_GET[$v];
-	if ($_POST[$v]) $x = $_POST[$v];
+	if (isset($_GET[$v]))  $x = $_GET[$v];
+	if (isset($_POST[$v])) $x = $_POST[$v];
 	if (get_magic_quotes_gpc()) $x = stripslashes($x);
 	return $x;
 }