update

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

@@ -206,7 +206,10 @@ public class TeacherServiceImpl extends BaseServiceImpl<Integer, Teacher>  imple
 					filter(teacher -> !Collections.disjoint(new ArrayList<>(Arrays.asList(teacher.getFlowOrganRange().split(","))),list)).collect(Collectors.toList());
 		}
 		List<Integer> userIds = teacherList.stream().map(e -> e.getId()).collect(Collectors.toList());
-		return teacherDao.findTeachers(userIds);
+		if(userIds != null && userIds.size() > 0){
+			return teacherDao.findTeachers(userIds);
+		}
+		return new ArrayList<>();
     }
 
 	@Override