Mehrere Empfänger E-Mail Adressen nicht möglich

Eingtragen sind zwei mit komma getrennt
Fatal error: Uncaught exception Swift_RfcComplianceException with message Address in mailbox given [xx@xx.ch, info] does not comply with RFC 2822, 3.6.2. thrown in system/modules/core/vendor/swiftmailer/classes/Swift/Mime/Headers/MailboxHeader.php on line 352
#0 system/modules/core/vendor/swiftmailer/classes/Swift/Mime/Headers/MailboxHeader.php(264): Swift_Mime_Headers_MailboxHeader->_assertValidAddress(xx@...')
#1 system/modules/core/vendor/swiftmailer/classes/Swift/Mime/Headers/MailboxHeader.php(108): Swift_Mime_Headers_MailboxHeader->normalizeMailboxes(Array)
#2 system/modules/core/vendor/swiftmailer/classes/Swift/Mime/Headers/MailboxHeader.php(65): Swift_Mime_Headers_MailboxHeader->setNameAddresses(Array)
#3 system/modules/core/vendor/swiftmailer/classes/Swift/Mime/SimpleHeaderFactory.php(60): Swift_Mime_Headers_MailboxHeader->setFieldBodyModel(Array)
#4 system/modules/core/vendor/swiftmailer/classes/Swift/Mime/SimpleHeaderSet.php(70): Swift_Mime_SimpleHeaderFactory->createMailboxHeader('To', Array)
#5 system/modules/core/vendor/swiftmailer/classes/Swift/Mime/SimpleMessage.php(325): Swift_Mime_SimpleHeaderSet->addMailboxHeader('To', Array)
#6 system/modules/core/library/Contao/Email.php(426): Swift_Mime_SimpleMessage->setTo(Array)
#7 system/modules/event-subscribe/src/Westwerk/EventSubscribe/Formdata/Processor.php(63): Contao\Email->sendTo(Array)
#8 system/modules/event-subscribe/src/Westwerk/EventSubscribe/Formdata/Processor.php(35): Westwerk\EventSubscribe\Formdata\Processor->processSingleEvent(Array, Array, Array)
#9 system/modules/core/forms/Form.php(491): Westwerk\EventSubscribe\Formdata\Processor->processSubmission(Array, Array, Array, Array, Object(Contao\Form))
#10 system/modules/core/forms/Form.php(225): Contao\Form->processFormData(Array, Array)
#11 system/modules/core/classes/Hybrid.php(218): Contao\Form->compile()
#12 system/modules/core/forms/Form.php(56): Contao\Hybrid->generate()
#13 system/modules/core/library/Contao/Controller.php(515): Contao\Form->generate()
#14 system/modules/core/library/Contao/Controller.php(1066): Contao\Controller->getForm('6')
#15 system/modules/core/classes/FrontendTemplate.php(154): Contao\Controller->replaceInsertTags('...', false)
#16 system/modules/core/pages/PageRegular.php(183): Contao\FrontendTemplate->output(true)
#17 index.php(253): Contao\PageRegular->generate(Object(Contao\PageModel), true)
#18 index.php(437): Index->run()
#19 {main}
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