diff --git a/webapp/models/Hero.php b/webapp/models/Hero.php
index e6039fd9..0ad35835 100644
--- a/webapp/models/Hero.php
+++ b/webapp/models/Hero.php
@@ -424,10 +424,11 @@ class Hero extends BaseModel {
             return true;
         }
         $locking = false;
+        $heroUniId = $heroDto['idx'];
         {
             $idx = 0;
             for ($i = 0; $i < kMaxHeroUpQualityNum; ++$i) {
-                $upHeroUniId = $this->_getV(TN_HERO_QUALITY_UP, $i);
+                $upHeroUniId = myself()->_getV(TN_HERO_QUALITY_UP, $i);
                 if ($upHeroUniId == $heroUniId) {
                     $idx = $i;
                     $locking = true;
@@ -438,7 +439,7 @@ class Hero extends BaseModel {
         if (!$locking) {
             $idx = 0;
             for ($i = 0; $i < kMaxHeroUpLevelNum; ++$i) {
-                $upHeroUniId = $this->_getV(TN_HERO_LEVEL_UP, $i);
+                $upHeroUniId = myself()->_getV(TN_HERO_LEVEL_UP, $i);
                 if ($upHeroUniId == $heroUniId) {
                     $idx = $i;
                     $locking = true;