网页呈现，但第一次使服务器崩溃，然后在不使服务器崩溃的情况下进行后续呈现

Question

我正在使用 NodeJS、Express 和 Express-handlebars 使用从 SQLITE3 数据库中提取的数据呈现网页。

代码有效，页面呈现正确，但第一次加载时，它使我的服务器崩溃并出现以下错误：TypeError: Cannot read property 'user_name_tag' of undefined

错误说它无法读取这个属性，但是在服务器崩溃之前正确地显示了它的信息。但是，如果重新启动服务器并重新加载页面，它不会崩溃，如果我在初始加载后打开一个具有不同用户和不同数据集的新实例，它也不会崩溃。

这是 index.js 代码：

const express = require('express');
const app = express();
const sqlite3 = require('sqlite3').verbose();
const db = new sqlite3.Database('../database.sqlite');
const exphbs = require('express-handlebars');
const hbs = exphbs.create({
    defaultLayout: 'main',
//custom helpers
    helpers: {
        iff: function(a, b, opts) {
            if (a == b) {
                return opts.fn(this);
            } else {
                return opts.inverse(this);
            }
        }
    }
});
app.engine('handlebars', hbs.engine);
app.set('view engine', 'handlebars');

app.get('/:userid', async (reg, res) => {
    const findUser = reg.params.userid;
    console.log('I am findUser ',findUser);
      let query = "SELECT users.user_id, users.balance, users.user_avatar, users.user_name_tag, user_collections.user_stamina, user_collections.collection_switch,";
      query += "COALESCE((SELECT SUM((SELECT (currency_shops.cost * user_items.amount) FROM currency_shops WHERE currency_shops.id = user_items.item_id)) FROM user_items WHERE user_items.user_id = users.user_id GROUP BY user_items.user_id), 0) as totalItems, ";
      query += "COALESCE((SELECT SUM((SELECT (craft_shops.cost * user_craft_items.amount) FROM craft_shops WHERE craft_shops.id = user_craft_items.item_id)) FROM user_craft_items WHERE user_craft_items.user_id = users.user_id GROUP BY user_craft_items.user_id), 0) as totalCraftItems, ";
      query += "COALESCE((SELECT SUM((SELECT (stonk_shops.cost * user_stonks.amount) FROM stonk_shops WHERE stonk_shops.id = user_stonks.item_id)) FROM user_stonks WHERE user_stonks.user_id = users.user_id GROUP BY user_stonks.user_id), 0) as totalStonks ";
      query += "FROM users, user_collections WHERE users.user_id = ? AND users.user_id = user_collections.user_id";
    await db.get(query, [findUser], (err, row ) => {
            (err, rows) => {       
        };
                res.render('profile', {
                title: 'User Profile',
                user_name: ([row.user_name_tag]),
                user_id:([row.user_id]),
                user_balance:([row.balance]),
                user_avatar:('src','https://cdn.discordapp.com/avatars/' + [row.user_id] + '/' + [row.user_avatar] + '.png'),
                user_stamina:([row.user_stamina]),
                user_networth:([row.balance + row.totalItems + row.totalCraftItems + row.totalStonks]),
                collection_switch:([row.collection_switch]),    
                isCollectionOn:([row.collection_switch]),
            }) 

   });

});
const PORT = process.env.PORT || 6999; 
app.listen(PORT, () => console.log(`Server started on port ${PORT}`));

这里是 HTML:

<h1>Welcome to your profile page {{user_name}} !</h1>
<h1>This is your ID number {{user_id}} .</h1>
<h1>This is your current credits balance {{user_balance}} .</h1>
<h1><img src='{{user_avatar}}'>This is your face!</img></h1>
<h1>This is your current stamina {{user_stamina}} .</h1>
<h1>This is your networth {{user_networth}}</h1>
{{#iff isCollectionOn 0}}
<h1>Your collection switch is set to {{collection_switch}}, you are free to collect!</h1>
{{else}}
<h1>This worked, congrats!</h1>
{{/iff}}

我希望这些信息足够了，如果需要，请随时让我提供更多信息。

Answer 1

所以我在使用 sublime 并决定切换到 visual studio 代码。 Visual studio codes linter 回答了我的问题。它告诉我我的 await 什么也没做，并建议删除我在那里的一个冗余功能，原因不明（可能是我尝试不同事情的遗留物）。它通过改变这个解决了：

await db.get(query, [findUser], (err, row ) => {
            (err, rows) => {       
        };
                res.render('profile', {

对此

    db.get(query, [findUser], (err, row ) => {
            res.render('profile', {

另外，我应该注意，我的网站图标似乎与我遇到的一些崩溃有关。我发现使用 Express 时，favicons 是通过 index.js 文件而不是 html 文件中的中间件处理的。

网页呈现，但第一次使服务器崩溃，然后在不使服务器崩溃的情况下进行后续呈现

Web page renders, but crashes the server the first time, then renders without crashing the server subsequent times

node.js

sqlite

express

express-handlebars