fix

zhongzheng-system/src/main/java/com/zhongzheng/modules/grade/service/impl/ClassGradeUserServiceImpl.java

@@ -4430,7 +4430,9 @@ public class ClassGradeUserServiceImpl extends ServiceImpl<ClassGradeUserMapper,
                     if(Validator.isNotEmpty(rVo.getVideoCurrentTime())){
                         item.setStudyTimeLongTxt(DateUtils.secToTime(rVo.getVideoCurrentTime().intValue()));
                     }
-
+                    if(Validator.isEmpty(rVo.getFromPlat())){
+                        item.setPlat(null);
+                    }
                     else if(rVo.getFromPlat()==1){
                         item.setPlat("小程序");
                     }