fix

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

@@ -1075,6 +1075,12 @@ public class ClassGradeServiceImpl extends ServiceImpl<ClassGradeMapper, ClassGr
             }else{
                 exportVo.setStudyStatusStr("已完成");
             }
+            if(Validator.isEmpty(classGradeStudentVo.getStudyCount())){
+                classGradeStudentVo.setStudyCount(0L);
+            }
+            if(Validator.isEmpty(classGradeStudentVo.getUseStudyCount())){
+                classGradeStudentVo.setUseStudyCount(0);
+            }
             exportVo.setTotalStudyCount(classGradeStudentVo.getUseStudyCount()+classGradeStudentVo.getStudyCount().intValue());
             if(Validator.isNotEmpty(classGradeStudentVo.getUserStatus())&&classGradeStudentVo.getUserStatus()==1){
                 exportVo.setUserStatus("变更");