diff --git a/libs/Smarty.class.php b/libs/Smarty.class.php
index e830c346..47b89a8b 100644
--- a/libs/Smarty.class.php
+++ b/libs/Smarty.class.php
@@ -1132,8 +1132,7 @@ class Smarty
                     $this->debugging = true;
                 }
             } else {
-                $_cookie_var = $this->request_use_auto_globals ? $_COOKIE['SMARTY_DEBUG'] : $GLOBALS['HTTP_COOKIE_VARS']['SMARTY_DEBUG'];
-                $this->debugging = $_cookie_var ? true : false;
+                $this->debugging = (bool)($this->request_use_auto_globals ? @$_COOKIE['SMARTY_DEBUG'] : @$GLOBALS['HTTP_COOKIE_VARS']['SMARTY_DEBUG']);
             }
         }