diff --git a/webapp/models/User.php b/webapp/models/User.php
index 7965f5fd..de6ad2af 100644
--- a/webapp/models/User.php
+++ b/webapp/models/User.php
@@ -56,14 +56,13 @@ class User extends BaseModel {
 
     public static function isValidHeadFrame($userInfo, $headFrame)
     {
-        $headFrameList = !empty($userInfo['head_frame_list']) ?
-                       json_decode($userInfo['head_frame_list'], true) : array();
+        $headFrameList = emptyRelace(json_decode($userInfo['head_frame_list'], true), array());
         return in_array($headFrame, $headFrameList);
     }
 
     private static function getHeadList($userInfo)
     {
-        $headList = !empty($userInfo['head_list']) ? json_decode($userInfo['head_list'], true) : array();
+        $headList = emptyRepalce(json_decode($userInfo['head_list'], true), array());
         $heroList = array();
         $heroSkinList = array();
         return $headList;