diff --git a/distfiles/login.php b/distfiles/login.php
index 14018e0..442e45b 100644
--- a/distfiles/login.php
+++ b/distfiles/login.php
@@ -9,11 +9,11 @@
 
 include("functions.php");
 
-$print = $_REQUEST['print'];
-$tech = $_REQUEST['tech'];
-$pass = $_REQUEST['pass'];
-$login = $_REQUEST['login'];
-$cancel = $_REQUEST['cancel'];
+$print = $_REQUEST['print'] ?? NULL;
+$tech = $_REQUEST['tech'] ?? NULL;
+$pass = $_REQUEST['pass'] ?? NULL;
+$login = $_REQUEST['login'] ?? NULL;
+$cancel = $_REQUEST['cancel'] ?? NULL;
 
 if ($cancel) {
     session_destroy();