MPDF throws undefined array key "boxbottom"

Question

I wanted to use mpdf 8.0.17 but ran into an undefined key error. I couldn't find any solution in their git repo or anywhere else. I got this Undefined array key "boxbottom" message even with the simplest example they provided.

I use laravel 8.65 and I've also tried carlos-meneses/laravel-mpdf 2.1.8 which also uses mpdf 8.0.17 and got the same undefined key message.

This is the simplest example I've tried so far:

$mpdf = new Mpdf([
   'tempDir' => __DIR__ . '/test',
]);

$mpdf->WriteHTML('Hello World');
dd($mpdf->Output());

and got this error message:

Undefined array key "boxbottom"

at this line:

vendor/mpdf/mpdf/src/Mpdf.php:11353
$midpoint = $lineBox[-1]['boxbottom'] - (($lineBox[-1]['boxbottom'] - $lineBox[-1]['boxtop']) / 2);

I've also tried to use the WriteHTML method with an empty string like this:

$mpdf->WriteHTML('');

and didn't get any errors, but my pdf file was empty of course.

Also tried the WriteCell function like this:

$mpdf->WriteCell(10, 10, 'test');

which didn't throw any errors, but the pdf file was empty.