diff --git a/src/main/resources/mapper/app/ResultRecordMapper.xml b/src/main/resources/mapper/app/ResultRecordMapper.xml
index 4fd04e4b..696487bf 100644
--- a/src/main/resources/mapper/app/ResultRecordMapper.xml
+++ b/src/main/resources/mapper/app/ResultRecordMapper.xml
@@ -379,7 +379,7 @@
     </select>
 
     <select id="countNumByScoreLevel" resultType="com.lz.modules.performance.res.ChartStatistical">
-        SELECT count(1) num,score_level,case score_level WHEN score_level is NULL  THEN '无等级' ELSE score_level END as 'desc' from lz_result_record where is_delete=0
+        SELECT count(1) num,score_level,case score_level is null WHEN true THEN '无等级' ELSE score_level END as 'desc' from lz_result_record where is_delete=0
         and start_id =#{startId}
         <if test="evaluationIds !=null and evaluationIds.size()!=0">
             and evaluation_id in (