[Bug]: PageLayoutMetrics::getResultData(): Return value must be of type array, null returned

[kingjia90]

Probably something broke with #325

Not sure how to reproduce it, just

            $page = $browser->createPage();
            $page->navigate($url)->waitForNavigation();

            $page->screenshot([
                'captureBeyondViewport' => true,
                'clip' => $page->getFullPageClip(),
            ])->saveToFile($outputFile);

[enricodias]

The key cssContentSize is missing in that response, but if we can't reproduce it the only thing we could do is just throw an exception.

[kingjia90]

somehow it happened when i locked the docker image of browserless/chrome to 1.16-chrome-stable but doesn't happen in the latest

What about falling back to windowSize when not found, eg. ['width'=>$options['windowSize'][0], 'height'=>$options['windowSize'][1]] ?