我有以下功能：

@SubscribeMessage('sendMessage')
  async handleSendMessage(
    _: Socket,
    payload: CreateMessageInput,
  ): Promise<void> {
    try {
      const created = this.em.create(Chat, {
        text: payload.text,
        user: payload.userId,
      });
      this.em.persistAndFlush(created);

      const { userName } = await this.em.findOneOrFail(User, {
        id: payload.userId,
      });

      this.server.emit('receiveMessage', {
        text: payload.text,
        user: { userName, id: payload.userId },
      });
    } catch (e) {
      if (e.name === 'NotFoundError') {
        throw new NotFoundException('User not found.');
      }
      throw new InternalServerErrorException('Something went wrong');
    }
  }

如果我在测试这个函数时忽略了user，我得到了ValidationError: Value for Chat.user is required, 'undefined' found，但是这个错误没有被我的catch子句捕获，导致套接字挂起。我该怎么解决这个问题？