SQL MailPoet Error

Alright, this error just caused my site to crash. Disabling MailPoet and MailPoet only fixed the site. Tangentially, a backup of my site was being done by UpDraft. I do not know if that is related.

I’ve had exactly the same happen to me. I have managed to get the site working again but often get 503 errors and when checking the site is using high CPU levels and large amounts of memory
Any ideas on how to fix?

@ashleyhorsley I had also disabled proxy access like this (https://perishablepress.com/wordpress-block-proxy-visits/) because I thought it would be good. It was not. So, at the same time my site was being backed up (high CPU and memory usage), MailPoet was producing that error and also reporting that it could not access the scheduler.

What I did was to disable MailPoet and UpdraftPlus and kill all of the processes that were running rampant. The easiest way to identify and kill those processes is to ssh into your server, run top, and then, from within top, killing the offending processes. Once the CPU usage was in check, I re-enabled MailPoet and then found out that MailPoet was having scheduling issues. I removed the proxy stuff and it can now connect to the scheduler.

Now, all of this seems different than the error shown above. It certainly is an uncaught exception that MailPoet should handle. However, because my site was doing more than one thing, I suppose I can’t definitely say that MailPoet alone crashed my site. My advice is to monitor your CPU usage over ssh and try to correlate what’s going on with each plugin, which is kinda hard to do.

Alright, this error appeared again this morning. It is a fact that at the time of the error the site was not undergoing a backup. I do not think that this error has any dependence on Updraft. That is, this is a standalone error within MailPoet that needs to be fixed.

It is possible that there is some configuration set incorrectly, but I do not know enough about how MailPoet works (and I’m not going to dig through your files because they are mostly minified) to come up with a solution myself. I will gladly provide any information necessary to help reach a resolution.

For months, several sites that I manage and that have MailPoet (free and pro) have been sending malfunction messages with the same values reported in this forum:

An E_ERROR error was caused in line 2 of the file /home/mydomain.it/wp-content/plugins/mailpoet/vendor-prefixed/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php. Messaggio di errore: Uncaught PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away in /home/mydomain.it/wp-content/plugins/mailpoet/lib/Doctrine/Driver/PDOConnection.php:85
Stack trace:
#0 /home/mydomain.it/wp-content/plugins/mailpoet/lib/Doctrine/Driver/PDOConnection.php(85): PDO->query(‘SELECT t0.name …’)
#1 /home/mydomain.it/wp-content/plugins/mailpoet/vendor-prefixed/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(2): MailPoet\Doctrine\Driver\PDOConnection->query(‘SELECT t0.name …’)
#2 /home/mydomain.it/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/mydomain.it/wp-content/plugins/mailpoet/vendor-prefixed/doctrine/orm/lib/Doctrine/ORM/EntityRepository.php(2): MailPoet

By accessing the sites, everything looks ok.
In the meantime, I have made numerous updates in recent months, but nothing changes, the error report keeps coming from time to time.

Finally, today MailPoet on a site with woocommerce, prevents woocommerce from sending emails for new orders received that were sent directly from the site and not with MailPoet.
There is to cry …

Hey there,

Uncaught PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away

Please refer to this article on how to fix this error on your WordPress website:
How to Fix General Error: 2006 MySQL Server has Gone Away

Thanks!