update

mec-biz/src/main/java/com/ym/mec/biz/service/impl/CourseScheduleServiceImpl.java

@@ -1650,7 +1650,7 @@ public class CourseScheduleServiceImpl extends BaseServiceImpl<Long, CourseSched
                 newCourseSchedule.setSchoolId(oldCourseSchedule.getSchoolId());
             }
 			if (newCourseSchedule.getTeachMode() != oldCourseSchedule.getTeachMode() && newCourseSchedule.getTeachMode() == TeachModeEnum.ONLINE) {
-				newCourseSchedule.setSchoolId(-1);
+				newCourseSchedule.setSchoolId(null);
 			}
 			
             if (Objects.isNull(newCourseSchedule.getActualTeacherId())) {