500 Internal Server Error

Invalid address: (addAnAddress to): (0)

#0 /home/cjemt96z4q3w/public_html/vendor/phpmailer/phpmailer/class.phpmailer.php(819): PHPMailer->addOrEnqueueAnAddress('to', NULL, '')
#1 /home/cjemt96z4q3w/public_html/App/helpers.php(232): PHPMailer->addAddress(NULL)
#2 /home/cjemt96z4q3w/public_html/App/helpers.php(151): sendEmail(Array, true)
#3 /home/cjemt96z4q3w/public_html/App/controllers/AppController.php(223): logEvent('404')
#4 /home/cjemt96z4q3w/public_html/vendor/mikecao/flight/flight/core/Dispatcher.php(197): AppController::notFound()
#5 /home/cjemt96z4q3w/public_html/vendor/mikecao/flight/flight/core/Dispatcher.php(142): flight\core\Dispatcher::invokeMethod(Array, Array)
#6 /home/cjemt96z4q3w/public_html/vendor/mikecao/flight/flight/core/Dispatcher.php(48): flight\core\Dispatcher::execute(Array, Array)
#7 /home/cjemt96z4q3w/public_html/vendor/mikecao/flight/flight/Engine.php(65): flight\core\Dispatcher->run('notFound', Array)
#8 /home/cjemt96z4q3w/public_html/vendor/mikecao/flight/flight/Engine.php(336): flight\Engine->__call('notFound', Array)
#9 /home/cjemt96z4q3w/public_html/vendor/mikecao/flight/flight/Engine.php(336): flight\Engine->notFound()
#10 /home/cjemt96z4q3w/public_html/vendor/mikecao/flight/flight/core/Dispatcher.php(196): flight\Engine->_start()
#11 /home/cjemt96z4q3w/public_html/vendor/mikecao/flight/flight/core/Dispatcher.php(142): flight\core\Dispatcher::invokeMethod(Array, Array)
#12 /home/cjemt96z4q3w/public_html/vendor/mikecao/flight/flight/core/Dispatcher.php(48): flight\core\Dispatcher::execute(Array, Array)
#13 /home/cjemt96z4q3w/public_html/vendor/mikecao/flight/flight/Engine.php(65): flight\core\Dispatcher->run('start', Array)
#14 /home/cjemt96z4q3w/public_html/vendor/mikecao/flight/flight/core/Dispatcher.php(196): flight\Engine->__call('start', Array)
#15 /home/cjemt96z4q3w/public_html/vendor/mikecao/flight/flight/core/Dispatcher.php(196): flight\Engine->start()
#16 /home/cjemt96z4q3w/public_html/vendor/mikecao/flight/flight/Flight.php(77): flight\core\Dispatcher::invokeMethod(Array, Array)
#17 /home/cjemt96z4q3w/public_html/index.php(11): Flight::__callStatic('start', Array)
#18 /home/cjemt96z4q3w/public_html/index.php(11): Flight::start()
#19 {main}