Why do sometimes informations not are gathering using puppeter? - puppeteer

Question

I'm using puppeter for gathering information and something one of these informations cames []. This is an example of how I'm calling the functions of puppeter
try {
const browser = await puppeteer.launch({
args: [
'--no-sandbox',
'--disable-setuid-sandbox',
],
});
const page = await browser.newPage();
await page.goto(url);
await page.waitForSelector('div#results');
await page.waitForSelector('h6.bestPrice');
const result = await page.evaluate(() => {
let items = document.querySelectorAll('maintable > tbody > tr.productsName > td > div.products');
if (items.length !== 0) {
let data = [];
items.forEach(function (el) {
let object = null;
el.querySelectorAll('h5 a').forEach(function (el) {
object = { product: el.innerHTML, img: [] };
});
el.querySelectorAll('p a').forEach(function (el) {
object.description = el.innerHTML;
});
el.querySelectorAll('h6.bestPriceText').forEach(function (el) {
object.price = el.innerHTML;
});
el.querySelectorAll('div.slide a.fancybox-thumbs img').forEach(function (el) {
object.img.push(el.getAttribute('src'));
});
data.push(object);
});
return data;
}
let error = null;
document.querySelectorAll('div.noResults div.info-message h2').forEach(function (el) {
error = ({ message: el.innerHTML });
});
return error;
});
await browser.close();
return result;
} catch (error) {
return { message: `Problems loading the page! Please, try again.${error}` };
}
};
The information which something comes empty is price, sorry but I can't reveal the url, but I would like to know if exists any problem with this design code.

Answer 1

A Friend suggest me to add a timeout, because it could be a problem with rendering
const resultado = await page.evaluate(async () => {
const timeout = (ms) => new Promise((resolve) => setTimeout(resolve, ms));
await timeout(5000);