diff --git a/webapp/phpcommon/functions.php b/webapp/phpcommon/functions.php
index 6b256fb..f1bf3c7 100644
--- a/webapp/phpcommon/functions.php
+++ b/webapp/phpcommon/functions.php
@@ -320,7 +320,7 @@ function isValidSessionId($account_id, $session_id)
     }
     if (SERVER_ENV == _ONLINE) {
         $channel = extractChannel($account_id);
-        if ($channel == 6000) {
+        if ($channel == 6000 && !defined('ENABLE_6000_CHANNEL')) {
             return false;
         }
     }