Fatal error: Call to a member function getData() on null

I suddenly am receiving the following error when I go to view and print a packing slip. Can you please advise?

Fatal error: Call to a member function getData() on null/home1/web/public_html/downeastthunderfarm/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/vendor/dompdf/dompdf/lib/Cpdf.php (1198)

#0 /home1/web/public_html/downeastthunderfarm/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/vendor/dompdf/dompdf/lib/Cpdf.php(944): WPO\IPS\Vendor\Dompdf\Cpdf->processFont(8, Array)

#1 /home1/web/public_html/downeastthunderfarm/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/vendor/dompdf/dompdf/lib/Cpdf.php(3208): WPO\IPS\Vendor\Dompdf\Cpdf->o_font(8, ‘add’)

#2 /home1/web/public_html/downeastthunderfarm/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/vendor/dompdf/dompdf/src/Adapter/CPDF.php(990): WPO\IPS\Vendor\Dompdf\Cpdf->output(false)

#3 /home1/web/public_html/downeastthunderfarm/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/vendor/dompdf/dompdf/src/Dompdf.php(935): WPO\IPS\Vendor\Dompdf\Adapter\CPDF->output(Array)

#4 /home1/web/public_html/downeastthunderfarm/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/includes/Makers/PDFMaker.php(57): WPO\IPS\Vendor\Dompdf\Dompdf->output()

#5 /home1/web/public_html/downeastthunderfarm/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/includes/Documents/OrderDocument.php(1409): WPO\IPS\Makers\PDFMaker->output()

#6 /home1/web/public_html/downeastthunderfarm/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/includes/Documents/OrderDocument.php(1475): WPO\IPS\Documents\OrderDocument->get_pdf()

#7 /home1/web/public_html/downeastthunderfarm/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/includes/Main.php(536): WPO\IPS\Documents\OrderDocument->output_pdf(‘inline’)

#8 /home1/web/public_html/downeastthunderfarm/wp-includes/class-wp-hook.php(324): WPO\IPS\Main->generate_document_ajax(”)

#9 /home1/web/public_html/downeastthunderfarm/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(”, Array)

#10 /home1/web/public_html/downeastthunderfarm/wp-includes/plugin.php(517): WP_Hook->do_action(Array)

#11 /home1/web/public_html/downeastthunderfarm/wp-admin/admin-ajax.php(192): do_action(‘wp_ajax_generat…’) #12 {main}

Here is a snapshot of the Status.