diff --git a/app/common.php b/app/common.php
index 2d769f956..0e548c1aa 100755
--- a/app/common.php
+++ b/app/common.php
@@ -3378,7 +3378,7 @@ function MyC($key, $default = '', $mandatory = false)
         return $default;
     }
     // 2. 未设置则默认值
-    if($mandatory === true && $cache_config_data[$key] === null)
+    if($mandatory === true && ($cache_config_data[$key] === null || $cache_config_data[$key] === ''))
     {
         return $default;
     }