We have a fatal error when clicking on the download invoice button.
PHP Fatal error: Uncaught Error: Call to a member function get_stylesheet() on null in /home/…/public_html/wp-content/plugins/print-invoices-packing-slip-labels-for-woocommerce/includes/vendor/dompdf/dompdf/src/FrameReflower/Page.php:53
wp-content/plugins/print-invoices-packing-slip-labels-for-woocommerce/admin/class-wf-woocommerce-packing-list-admin.php(947): do_action()
Thanks for your help!