How to properly use the mpdf library in php (chrome bug)?

Question

PHP

Here is the code that generates the pdf and opens it in the browser:

header("Content-Type: application/pdf");
            header("Content-Disposition:inline;filename=\"invoice.pdf\"");
            header("Content-Transfer-Encoding: binary");

            ob_start();
            include 'file.php';
            $html = ob_get_contents();
            ob_end_clean();

            include("mpdf60/mpdf.php");

            $mpdf = new mPDF('utf-8', 'A4', '12', '', 10, 10, 7, 7, 10, 10);

            $stylesheet = file_get_contents('css/invoice.css'); //подключаем css
            $mpdf->WriteHTML($stylesheet, 1);

            $mpdf->WriteHTML($html, 2); //формируем pdf
            $mpdf->Output('file.pdf', 'I');

Everything is fine in the mazil, but in chrome it says "Failed to load pdf document" with the "Reload" button, which you click on, the page is updated and everything is fine.
How to get rid of this error, and so that the pdf is loaded immediately?