diff --git a/include/class.misc.php b/include/class.misc.php
index b5ce887053eba3be836dbc976aa23447c2b8ca80..10130e2df607889a1c4f173ee9a0291f29de7429 100644
--- a/include/class.misc.php
+++ b/include/class.misc.php
@@ -145,7 +145,7 @@ class Misc {
     function currentURL() {
 
         $str = 'http';
-        if ($_SERVER['HTTPS'] == 'on') {
+        if (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') {
             $str .='s';
         }
         $str .= '://';