Undefined array key “errors”

Hi, after upgrading from PHP 7.4->8.1 I am observing this error:

2023/01/24 01:57:48 [error] 26410#26410: *51810 FastCGI sent in stderr: “PHP message: PHP Warning: Undefined array key “errors” in /www/oremcommx_742/public/wp-content/plugins/activecampaign-for-woocommerce/includes/api-client/class-activecampaign-for-woocommerce-api-client-graphql.php on line 99″ while reading upstream, client: 184.146.15.202, server: env-oremcommx-staging.kinsta.cloud, request: “POST /?wc-ajax=checkout&wfacp_id=236690&wfacp_is_checkout_override=yes HTTP/1.1”, upstream: “fastcgi://unix:/var/run/php8.1-fpm-oremcommx.sock:”, host: “env-oremcommx-staging.kinsta.cloud:53274”, referrer: “https://env-oremcommx-staging.kinsta.cloud/checkout/”