Error 320 when syncing Google calendar

For several years I used JEvents and have had a calendar that's anonymously refreshed with a cronjob to Google Calendar. I just noticed it's not being refreshed anymore. When I manually refresh the calendar I get the following error.

Any idea where to look for the problem?
How can I find which event is 1648837800?

There were problems saving the event detailProblem saving event Exception: Problem saving event (1648837800) : Incorrect string value: '\xF0\x9F\x99\x82<b...' for column `hhzvplons_3x`.`osjrt_jevents_vevdetail`.`description` at row 1 in /home/hhzvplons/domains/plons.nu/public_html/components/com_jevents/libraries/iCalEventDetail.php:301 Stack trace: #0 /home/hhzvplons/domains/plons.nu/public_html/components/com_jevents/libraries/iCalEvent.php(295): iCalEventDetail->store(false) #1 /home/hhzvplons/domains/plons.nu/public_html/components/com_jevents/libraries/iCalICSFile.php(441): iCalEvent->store(false, true) #2 /home/hhzvplons/domains/plons.nu/public_html/administrator/components/com_jevents/controllers/icals.php(442): iCalICSFile->store() #3 /home/hhzvplons/domains/plons.nu/public_html/libraries/src/MVC/Controller/BaseController.php(678): AdminIcalsController->save() #4 /home/hhzvplons/domains/plons.nu/public_html/components/com_jevents/jevents.php(364): Joomla\CMS\MVC\Controller\BaseController->execute('reload') #5 /home/hhzvplons/domains/plons.nu/public_html/libraries/src/Dispatcher/LegacyComponentDispatcher.php(71): require_once('/home/hhzvplons...') #6 /home/hhzvplons/domains/plons.nu/public_html/libraries/src/Dispatcher/LegacyComponentDispatcher.php(73): Joomla\CMS\Dispatcher\LegacyComponentDispatcher::Joomla\CMS\Dispatcher\{closure}('/home/hhzvplons...') #7 /home/hhzvplons/domains/plons.nu/public_html/libraries/src/Component/ComponentHelper.php(361): Joomla\CMS\Dispatcher\LegacyComponentDispatcher->dispatch() #8 /home/hhzvplons/domains/plons.nu/public_html/libraries/src/Application/SiteApplication.php(208): Joomla\CMS\Component\ComponentHelper::renderComponent('com_jevents') #9 /home/hhzvplons/domains/plons.nu/public_html/libraries/src/Application/SiteApplication.php(249): Joomla\CMS\Application\SiteApplication->dispatch() #10 /home/hhzvplons/domains/plons.nu/public_html/libraries/src/Application/CMSApplication.php(293): Joomla\CMS\Application\SiteApplication->doExecute() #11 /home/hhzvplons/domains/plons.nu/public_html/includes/app.php(61): Joomla\CMS\Application\CMSApplication->execute() #12 /home/hhzvplons/domains/plons.nu/public_html/index.php(32): require_once('/home/hhzvplons...') #13 {main}