E_Error

We have recently migrated to Mailpoet 3 and it seems to be working fine but we keep getting the following error. Any thoughts?

WordPress version 6.0.1
Active theme: Twenty Seventeen (version 3.0) Current plugin: MailPoet 3 (New) (version 3.94.0) PHP version 7.4.28

Error Details
=============
An error of type E_ERROR was caused in line 91 of the file /var/www/vhosts/adderleyparish.co.uk/httpdocs/wp-content/plugins/mailpoet/vendor-prefixed/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php. Error message: Uncaught PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away in /var/www/vhosts/adderleyparish.co.uk/httpdocs/wp-content/plugins/mailpoet/vendor-prefixed/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php:59
Stack trace:
#0 /var/www/vhosts/adderleyparish.co.uk/httpdocs/wp-content/plugins/mailpoet/vendor-prefixed/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php(59): PDOStatement->execute()
#1 /var/www/vhosts/adderleyparish.co.uk/httpdocs/wp-content/plugins/mailpoet/vendor-prefixed/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(495): MailPoetVendor\Doctrine\DBAL\Driver\PDOStatement->execute()
#2 /var/www/vhosts/adderleyparish.co.uk/httpdocs/wp-content/plugins/mailpoet/vendor-prefixed/doctrine/orm/lib/Doctrine/ORM/Persisters/Entity/BasicEntityPersister.php(375): MailPoetVendor\Doctrine\DBAL\Connection->executeQuery()
#3 /var/www/vhosts/adderleyparish.co.uk/httpdocs/wp-content/plugins/mailpoet/vendor-prefixed/doctrine/orm/lib/Doctrine/ORM/EntityRepository.php(78): MailPoetVen