Jest beforeall / afterall setup error for browser instance (launched with puppeteer)

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Javascript

automation

Async

Can anyone sense the cause of this error for the below code ?

TypeError: Cannot read property 'close' of null

    18 |
    19 |   afterAll(async () => {
  > 20 |     await browser.close();

(Please don't mind the style, as a Javascript mixture of Jest and Puppeteer):

let browser = null;

describe('Load page', () => {

  beforeAll(async () => { 
    browser = await puppeteer.launch({ 
      headless: false    
    });

  });

  afterAll(async () => {
    browser.close();
  });

What I have tried:

I put an

await

before

browser.close()

, but it doesn't solve the problem (or make too much sense):

afterAll(async () => {
    browser.close();
  });