plugin broken with php8.1

2022/06/13 13:24:37 [error] 875#875: *3 FastCGI sent in stderr: “PHP message: PHP Warning: Undefined array key “mensaje_pendiente” in /var/www/wp-content/plugins/woocommerce-apg-sms-notifications/apg-sms.php on line 60PHP message: PHP Warning: Undefined array key “mensaje_fallido” in /var/www/wp-content/plugins/woocommerce-apg-sms-notifications/apg-sms.php on line 60PHP message: PHP Warning: Undefined array key “mensaje_devuelto” in /var/www/wp-content/plugins/woocommerce-apg-sms-notifications/apg-sms.php on line 60PHP message: PHP Warning: Undefined array key “mensaje_cancelado” in /var/www/wp-content/plugins/woocommerce-apg-sms-notifications/apg-sms.php on line 60″ while reading response header from upstream, client: 10.33.0.13, server: , request: “POST /wp-admin/admin-ajax.php HTTP/1.1”, upstream: “fastcgi://127.0.0.1:9000”,