diff --git a/distfiles/gpl.php b/distfiles/gpl.php
index c8a40d6..3991153 100644
--- a/distfiles/gpl.php
+++ b/distfiles/gpl.php
@@ -10,7 +10,7 @@
 include("functions.php");
 
 
-$print=$_REQUEST['print'];
+$print=$_REQUEST['print'] ?? NULL;
 
 if ($print) {
     $sbcolor=P_SIDEBAR_COLOR;