diff --git a/function/common.php b/function/common.php
index 5d6ac28..9bca61c 100644
--- a/function/common.php
+++ b/function/common.php
@@ -490,7 +490,7 @@ function main($path)
 //echo 'main.enterpath:'.$path.'
 //';
     if (isset($_COOKIE['language'])) $constStr['language'] = $_COOKIE['language'];
-    if (!isset($constStr['language'])) $constStr['language'] = getConfig('language');
+    if (!$constStr['language']) $constStr['language'] = getConfig('language');
     if ($constStr['language']=='') $constStr['language'] = 'en-us';
     $_SERVER['language'] = $constStr['language'];
     $_SERVER['PHP_SELF'] = path_format($_SERVER['base_path'] . $path);