update

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

@@ -2967,8 +2967,11 @@ public class CourseScheduleServiceImpl extends BaseServiceImpl<Long, CourseSched
 			// 修改了主教/助教/课程状态，需修改考勤记录
 			List<TeacherAttendance> teacherAttendanceList = teacherAttendanceMap.get(courseScheduleId);
 
-			List<Integer> oldTeacherIdList = teacherAttendanceList.stream().map(TeacherAttendance::getTeacherId).distinct().collect(Collectors.toList());
-            List<Integer> newTeacherIdList = new ArrayList<>();
+			List<Integer> oldTeacherIdList = new ArrayList<Integer>();
+			if(teacherAttendanceList != null){
+				oldTeacherIdList = teacherAttendanceList.stream().map(TeacherAttendance::getTeacherId).distinct().collect(Collectors.toList());
+			}
+			List<Integer> newTeacherIdList = new ArrayList<>();
             newTeacherIdList.addAll(newCourseSchedule.getTeachingTeacherIdList());
             newTeacherIdList.add(newCourseSchedule.getActualTeacherId());