diff --git a/inc/class.page.php b/inc/class.page.php
--- a/inc/class.page.php
+++ b/inc/class.page.php
@@ -47,6 +47,7 @@ set_include_path(get_include_path() . PA
 $use_captcha = FALSE;
 $admin_enable_purge = FALSE;
 $qtips_always = FALSE;
+$input_warning_banner = FALSE;
 
 $config_inc = dirname(__FILE__) . DIRECTORY_SEPARATOR . 'config.inc';
 if (file_exists($config_inc)) {