3.2.2 Fatal error with WCMP plugin

Since 3.2.2, this call (from WCMP plugin)

{domain}/wp-admin/edit.php?s=&post_status=all&post_type=dc_commission&_wpnonce=715a71c529&_wp_http_referer=%2Fwp-admin%2Fedit.php%3Fs%26post_status%3Dall%26post_type%3Ddc_commission%26action%3D-1%26m%3D0%26commission_status%3Dunpaid%26commission_vendor%26layout%26filter_action%3DFiltrer%26paged%3D4%26action2%3D-1&action=mark_paid&m=0&commission_status=&commission_vendor=&layout=&paged=4&post%5B%5D=48703&post%5B%5D=48698&post%5B%5D=48694&post%5B%5D=48690&post%5B%5D=48684&post%5B%5D=48680&post%5B%5D=48676&post%5B%5D=48671&post%5B%5D=48667&post%5B%5D=48663&post%5B%5D=48654&post%5B%5D=48649&post%5B%5D=48633&post%5B%5D=47715&post%5B%5D=47682&post%5B%5D=47574&action2=mark_paid

do a fatal error

Fatal error: Uncaught Error: Call to undefined method WP_Post::get_id() in /www/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/includes/class-wcpdf-main.php:80 Stack trace: #0 /www/wp-includes/class-wp-hook.php(307): WPO\WC\PDF_Invoices\Main->attach_pdf_to_email(Array, 'vendor_commissi...', Object(WP_Post), Object(WC_Email_Vendor_Commission_Transactions)) #1 /www/wp-includes/plugin.php(191): WP_Hook->apply_filters(Array, Array) #2 /www/wp-content/plugins/woocommerce/includes/emails/class-wc-email.php(463): apply_filters('woocommerce_ema...', Array, 'vendor_commissi...', Object(WP_Post), Object(WC_Email_Vendor_Commission_Transactions)) #3 /www/wp-content in /www/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/includes/class-wcpdf-main.php on line 80
Une erreur critique est survenue sur ce site. Veuillez consulter la boite de réception de l’e-mail d’administration de votre site pour plus d’informations.