diff --git a/webapp/models/Hero.php b/webapp/models/Hero.php
index 18cddf0a..118f3506 100644
--- a/webapp/models/Hero.php
+++ b/webapp/models/Hero.php
@@ -424,7 +424,7 @@ class Hero extends BaseModel {
             return true;
         }
         $locking = false;
-        $heroUniId = empty($heroDto['hero_uniid']) ? $heroDto['hero_uniid'] : $heroDto['idx'];
+        $heroUniId = !empty($heroDto['hero_uniid']) ? $heroDto['hero_uniid'] : $heroDto['idx'];
         {
             $idx = 0;
             for ($i = 0; $i < kMaxHeroUpQualityNum; ++$i) {