When I am clicking on the button to download invoice or packing slip, it lands in error page.
Fatal error: Call to a member function length_in_pt() on null/srv/htdocs/wp-content/plugins/woo-gst/invoice/vendor/dompdf/dompdf/src/FrameDecorator/Page.php (110)#0 /srv/htdocs/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/vendor/dompdf/dompdf/src/Dompdf.php(761): Dompdf\FrameDecorator\Page->set_containing_block(0, 0, 595.28, 841.89) #1 /srv/htdocs/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/includes/class-wcpdf-pdf-maker.php(53): Dompdf\Dompdf->render() #2 /srv/htdocs/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/includes/documents/abstract-wcpdf-order-document.php(842): WPO\WC\PDF_Invoices\PDF_Maker->output() #3 /srv/htdocs/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/includes/documents/abstract-wcpdf-order-document.php(908): WPO\WC\PDF_Invoices\Documents\Order_Document->get_pdf() #4 /srv/htdocs/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/includes/class-wcpdf-main.php(454): WPO\WC\PDF_Invoices\Documents\Order_Document->output_pdf(‘inline’) #5 /wordpress/core/6.3/wp-includes/class-wp-hook.php(310): WPO\WC\PDF_Invoices\Main->generate_pdf_ajax(”) #6 /wordpress/core/6.3/wp-includes/class-wp-hook.php(334): WP_Hook->apply_filters(”, Array) #7 /wordpress/core/6.3/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #8 /wordpress/core/6.3/wp-admin/admin-ajax.php(188): do_action(‘wp_ajax_generat…’)
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