fatal error while downloading pdf

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!


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