없는 게시물 처리 (강의 : 쇼핑몰처럼 상세 페이지 만들기)

app.delete('/delete', function(req, res){

    var id = req.body.id;

    var sql = 'DELETE FROM post WHERE id=?';

    connection.query(sql,[id],function(err,topics){
        if(err)
            {
                console.log(err)
                res.status(500).send('Internal Server Error');
            }
            else
            {
                res.status(200).send({message: '성공했습니다.'});
            }
    });
});

app.get('/detail/:id', function(요청, 응답){
  var id= parseInt(요청.params.id);
  var sql = 'SELECT id, title, content FROM post WHERE id=?';
  connection.query(sql,[id],function(err,topics){

    if (topics === null)
    {
      응답.status(500).send('Internal Server Error');
    }
    else
    {
      응답.render('detail.ejs', {posts: topics[0]});
    }

  })
})

app.get('/detail/:id', function(요청, 응답){
  var id= parseInt(요청.params.id);
  var sql = 'SELECT id, title, content FROM post WHERE id=?';
  connection.query(sql,[id],function(err,topics){

    if (topics === null)
    {
      응답.status(500).send('Internal Server Error');
    }
    else
    {
      응답.render('detail.ejs', {posts: topics[0]});
    }

  })
})

server.js 이거 하나밖에 없습니다
위에 오류가 뜬거는 id를 제가 직접 접속해본거입니다



글 id list

글 id 잇는거 접속

id 없는거 접

[nodemon] restarting due to changes...
[nodemon] starting `node server.js`
listening on 80
연결된듯
[]
TypeError: C:\Users\atolo\Desktop\node\views\detail.ejs:22
    20|         <div class="center-menu">
    21|             <h4>상세페이지</h4>
 >> 22|                 <h4>제목: <%= posts.title %></h4>
    23|                 <p>내용 : <%= posts.content %></p>
    24|
    25|         </div>

Cannot read properties of undefined (reading 'title')
    at eval ("C:\\Users\\atolo\\Desktop\\node\\views\\detail.ejs":15:32)
    at detail (C:\Users\atolo\Desktop\node\node_modules\ejs\lib\ejs.js:703:17)
    at tryHandleCache (C:\Users\atolo\Desktop\node\node_modules\ejs\lib\ejs.js:274:36)
    at View.exports.renderFile [as engine] (C:\Users\atolo\Desktop\node\node_modules\ejs\lib\ejs.js:491:10)
    at View.render (C:\Users\atolo\Desktop\node\node_modules\express\lib\view.js:135:8)
    at tryRender (C:\Users\atolo\Desktop\node\node_modules\express\lib\application.js:657:10)
    at Function.render (C:\Users\atolo\Desktop\node\node_modules\express\lib\application.js:609:3)
    at ServerResponse.render (C:\Users\atolo\Desktop\node\node_modules\express\lib\response.js:1039:7)
    at Query.onResult (C:\Users\atolo\Desktop\node\server.js:120:10)
    at C:\Users\atolo\Desktop\node\node_modules\mysql2\lib\commands\query.js:86:16

topics가 null값이 뜨길래

app.get('/detail/:id', function(요청, 응답){
  var id= parseInt(요청.params.id);
  var sql = 'SELECT id, title, content FROM post WHERE id=?';
  connection.query(sql,[id],function(err,topics){

    console.log(topics);
    if (topics == null)
    {
      응답.render('err.ejs');
    }
    else
    {
      응답.render('detail.ejs', {posts: topics[0]});
    }

  })
})

null값이 뜨면 err.ejs 로 render 해줘야되는데 오류가 뜨네요 ㅠㅠ