diff --git a/web/Application/SLN0002/DAO/SubjectDAO.class.php b/web/Application/SLN0002/DAO/SubjectDAO.class.php
index a08a1169..11219087 100644
--- a/web/Application/SLN0002/DAO/SubjectDAO.class.php
+++ b/web/Application/SLN0002/DAO/SubjectDAO.class.php
@@ -1421,7 +1421,7 @@ class SubjectDAO extends PSIBaseExDAO
         return $this->bad("表[{$codeTableName}]的字段[{$lookupFieldName}]不存在");
       }
     } else {
-      $tableNameVoucher = "";
+      $codeTableName = "";
       $codeTableFieldNameFK = "";
       $codeTableFieldName = "";
       $lookupFieldName = "";