update

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

@@ -87,7 +87,10 @@ public class TeacherLeaveRecordServiceImpl extends BaseServiceImpl<Long, Teacher
 		Set<Integer> roleIds = new HashSet<>(1);
 		Teacher teacher = teacherDao.get(userId);
 		roleIds.add(SysUserRole.DEAN_OF_STUDIES);
-		sysMessageService.batchSeoMessage(musicGroupDao.queryUserIdByRoleId(roleIds),MessageTypeEnum.EDUCATION_PUSH_TEACHER_LEAVE_APPLY,"",teacher.getRealName());
+		Set<Integer> userIds = musicGroupDao.queryUserIdByRoleId(roleIds);
+		if (userIds != null && userIds.size() > 0) {
+			sysMessageService.batchSeoMessage(userIds, MessageTypeEnum.EDUCATION_PUSH_TEACHER_LEAVE_APPLY, "", teacher.getRealName());
+		}
 		return true;
 	}