Troubleshooting puppeteer error: "Property 'contentFrame' of null cannot be read"

I've encountered a bug while trying to request an API that I've implemented. After using one of the endpoints, it throws the following error, as shown below.

Is there any way to handle this error?

Error message:

TypeError: Cannot read property 'contentFrame' of null
    at Object.getAnimeVideo (C:\Users\c\Desktop\ryuanime\src\api\scraper.ts:89:37)
    at process._tickCallback (internal/process/next_tick.js:68:7)

Code:

const getAnimeVideo = async (id: string, chapter: number) => {
  const BASE_URL = `${url}${id}/${chapter}/`;
  const browser = await puppeteer.launch();
  const page = await browser.newPage();
  await page.goto(BASE_URL);
  const elementHandle = await page.$('.player_conte');
  const frame = await elementHandle.contentFrame(); //line 89 error
  const video = await frame.$eval('#jkvideo_html5_api', el =>
    Array.from(el.getElementsByTagName('source')).map(e => e.getAttribute("src")));
  await browser.close();
  return video;
}
typescriptiframepuppeteer

Answer №1

Issue

The elementHandle variable is returning as null, causing the error message stating that the function contentFrame does not exist on a null object. This occurs when page.$ returns null because the specified selector cannot be found.

Resolution

In order to address this issue, consider the following steps:

  • Verify that the selector used is correct and is located within the page or an embedded frame, and is not misspelled.

  • It is possible that the desired element is not yet loaded when the script is executed. If the page dynamically loads additional content and modifies the DOM, you can utilize page.waitForSelector to wait until the element is available:

    const elementHandle = await page.waitForSelector('.player_conte');

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