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cooleshow-user/user-biz/src/main/java/com/yonge/cooleshow/biz/dal/service/impl/TeacherServiceImpl.java

@@ -764,6 +764,9 @@ public class TeacherServiceImpl extends ServiceImpl<TeacherDao, Teacher> impleme
 
         List<TeacherWrapper.TeacherFriend> customerServiceFriendNums = this.getBaseMapper().getCustomerServiceFriendNums();
         customerServiceFriendNums.removeIf(n -> n.getTeacherId().equals(userId));
+        if (customerServiceFriendNums.isEmpty()) {
+            return result;
+        }
         List<Long> customerIdList = customerServiceFriendNums.stream().map(TeacherWrapper.TeacherFriend::getTeacherId).collect(Collectors.toList());
         List<ImUserFriend> userFriendList = friendList.stream()
                 .filter(n -> !ClientEnum.TEACHER.equals(n.getFriendType()) || !customerIdList.contains(n.getFriendId()))