Database Issue From Mailpoet

I’m getting this email –
Howdy!

Since WordPress 5.2 there is a built-in feature that detects when a plugin or theme causes a fatal error on your site, and notifies you with this automated email.

In this case, WordPress caught an error with one of your plugins, MailPoet 3 (New).
Error Details
=============
An error of type E_ERROR was caused in line 2 of the file /home/wp_7n4erf/eagle-investors.com/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 /home/wp_7n4erf/eagle-investors.com/wp-content/plugins/mailpoet/vendor-prefixed/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php:2
Stack trace:
#0 /home/wp_7n4erf/eagle-investors.com/wp-content/plugins/mailpoet/vendor-prefixed/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php(2): PDO->query(‘SELECT t0.name …’)
#1 /home/wp_7n4erf/eagle-investors.com/wp-content/plugins/mailpoet/vendor-prefixed/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(2): MailPoetVendor\Doctrine\DBAL\Driver\PDOConnection->query(‘SELECT t0.name …’)
#2 /home/wp_7n4erf/eagle-investors.com/wp-content/plugins/mailpoet/vendor-prefixed/doctrine/orm/lib/Doctrine/ORM/Persisters/Entity/BasicEntityPersister.php(2): MailPoetVendor\Doctrine\DBAL\Connection->executeQuery(‘SELECT t0.name …’, Array, Array)
#3 /home/wp_7n4erf/eagle-investors.com/wp-content/plugins/mailpoet/vendor-prefixed/doctrine/orm/lib/Doctrine/ORM/EntityRepository.php(2): Mail