diff --git a/src/main/resources/mybatis-mapper/modules/iup-kkotalk-mapper.xml b/src/main/resources/mybatis-mapper/modules/iup-kkotalk-mapper.xml
index 0d82873..dc58c28 100644
--- a/src/main/resources/mybatis-mapper/modules/iup-kkotalk-mapper.xml
+++ b/src/main/resources/mybatis-mapper/modules/iup-kkotalk-mapper.xml
@@ -121,7 +121,7 @@
           FROM ens_snd_dtl_kko_talk
          WHERE send_mast_id = #{sendMastId}
            AND envelope_id IS NOT NULL
-           AND (status != 'READ' OR NVL(status, '') = '')
+           AND (status != 'READ' OR status IS NULL OR status = '')
     </select>
 
     <select id="findAllFetchBySendMastId" parameterType="long" resultType="cokr.xit.ens.modules.kkotalk.model.SendDetailKkoTalkDTO">