diff --git a/webapp/controller/HeroController.class.php b/webapp/controller/HeroController.class.php
index fa8bea5a..785c855d 100644
--- a/webapp/controller/HeroController.class.php
+++ b/webapp/controller/HeroController.class.php
@@ -388,7 +388,7 @@ class HeroController extends BaseAuthedController {
             $this->_rspErr(1, 'slot_id parameter error');
             return;
         }
-        $costHeroDb = Hero::find($costheroUniId);
+        $costHeroDb = Hero::find($costHeroUniId);
         if (!$costHeroDb) {
             $this->_rspErr(1, 'cost hero parameter error');
             return;