DM 내용 표시하기

안녕하세요 강의중에 DM 내용 표시 하기 강의에서 map을 활용해 DM내용을 표시하는 부분인데

DM을 클릭하고 내용을 확인할 때 TypeError에러가 뜨면서 chatData.map is not a function 이라는 오류가 나오고 있습니다.. 혼자 해결하다 막혀서 질문 남겨 드립니다!

DirectMessage.tsx (return 부분)

return (
    <Container>
      <Header>
        <img src={gravatar.url(userData.email, { s: '24px', d: 'retro' })} alt={userData.nicknam} />
        <span>{userData.nickname}</span>
      </Header>
      <ChatList chatData={chatData} />
      <ChatBox chat={chat} onChangeChat={onChangeChat} onSubmitForm={onSubmitForm} />
    </Container>
  );

chatList.tsx

import React, { VFC, useCallback, useRef } from 'react';
import { ChatZone } from './styles';
import { IDM } from '@typings/db';
import Chat from '@components/Chat';
import { Scrollbars } from 'react-custom-scrollbars';

interface Props {
  chatData?: IDM[];
}

const ChatList: VFC<Props> = ({ chatData }) => {
  const scrollbarRef = useRef(null);

  const onScroll = useCallback(() => {}, []);

  return (
    <ChatZone>
      <Scrollbars autoHide ref={scrollbarRef} onScrollFrame={onScroll}>
        {chatData?.map((chat) => (
          <Chat key={chat.id} data={chat} />
        ))}
      </Scrollbars>
    </ChatZone>
  );
};

export default ChatList;

chat.tsx

import { IDM, IChat } from '@typings/db';
import React, { VFC, memo, useMemo } from 'react';
import gravatar from 'gravatar';
import { ChatWrapper } from './styles';

interface Props {
  data: IDM;
}

const Chat: VFC<Props> = ({ data }) => {
  const user = data.Sender;

  return (
    <ChatWrapper>
      <div className="chat-img">
        <img src={gravatar.url(user.email, { s: '36px', d: 'retro' })} alt={user.nickname} />
      </div>
      <div className="chat-text">
        <div className="chat-user">
          <b>{user.nickname}</b>
          <span>{data.createdAt}</span>
        </div>
        <p>{data.content}</p>
      </div>
    </ChatWrapper>
  );
};

export default Chat;

오류내용