Getting a Fatal error when Synchronise Login logout is enabled

I have a WP install that is relatively fresh. Very minimal until the last month or so when I started working a lot on it.

I installed CiviCRM for a membership site, and installed useful plugins, like this one.

But then when I was logging into the site it gave a severe error.

Fatal error: Uncaught PEAR_Exception: DB Error: unknown error in /home/<WEBDIRECTORY>/public_html/wp-content/plugins/civicrm/civicrm/vendor/pear/pear-core-minimal/src/PEAR.php on line 922  - DB_Error DB Error: unknown error in unknown on line unknown. Exception trace

CRM_Core_Error::exceptionHandler(Object(DB_Error))

/home/<WEBDIRECTORY>/public_html/wp-content/plugins/civicrm/civicrm/vendor/pear/pear-core-minimal/src/PE

 in 

/home/<WEBDIRECTORY>/public_html/wp-content/plugins/civicrm/civicrm/CRM/Core/Error.php on line 943

Under “Synchronisation Events”
If I turn off “Login and Logout” then the problem goes away. At least for login and logout. Not sure whats going to happen with the other synchronsation events.

Under the Manual Synchronize tab, if I do a manual synchronise it doesn’t error out.

Not sure if this is an unfortunate interaction, or something else…

I can reproduce it every time by enabling the “Login and Logout” option in this plugin.

I’m running CivCRM 5.36.0, WP 5.7.1 with all plugins and themes updated to the latest.

(CiviCRM has a .1 update its telling me about, but I don’t want to take the time for that right this instant.)

Running MySQL 5.7.34, PHP 7.3.27 on a WHM/Cpanel instance