diff --git a/emis-biz/src/main/resources/mapper/EmisCustomerUserMapper.xml b/emis-biz/src/main/resources/mapper/EmisCustomerUserMapper.xml
index 96e6667c6..754bdd476 100644
--- a/emis-biz/src/main/resources/mapper/EmisCustomerUserMapper.xml
+++ b/emis-biz/src/main/resources/mapper/EmisCustomerUserMapper.xml
@@ -367,7 +367,7 @@
 
 
     <select id="selectMaxCustomerCodeBySite" parameterType="String" resultType="Long">
-          select IF(max(customer_code) is NULL,CONCAT(#{ownSiteCode},LPAD('1',6,'0')),CONCAT(CONVERT(customer_code,SIGNED)+1,'')) as code
+          select IF(max(customer_code) is NULL,CONCAT(#{ownSiteCode},LPAD('1',6,'0')),CONCAT(CONVERT(max(customer_code),SIGNED)+1,'')) as code
           from emis_customer_user  where owner_site = #{ownSiteCode}
     </select>