I had this code working few updates ago. It displays product attribute called "manufacturer" on the invoice. Now, the invoice show up with white background and black text only. I think the code might be outdated. Any suggestions?
</dt><dt><?php $wpo_wcpdf->product_attribute('manufacturer', $item['product']); ?></dt>
https://wordpress.org/plugins/woocommerce-pdf-invoices-packing-slips/
Edit: The problem was due to the deletion of the product from my inventory. Causing the PDF invoice to display nothing but plain text. Is there a way to avoid this?