$INC = sprintf("%sinc/modules/guest/what-%s.php", PATH, $GLOBALS['what']);
$IS_VALID = WHAT_IS_VALID(GET_ACTION("guest", $GLOBALS['what']), $GLOBALS['what'], "guest");
-if (FILE_READABLE($INC)) && ($IS_VALID)) {
+if ((FILE_READABLE($INC)) && ($IS_VALID)) {
// Ok, we finally load the guest action module
require_once($INC);
} elseif ($IS_VALID) {