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TypeError: Argument 1 passed to Drupal\digest\Entity\Digest::send() must implement interface Drupal\user\UserInterface, null given, called in /home/boost4bsoeu/drupal/web/modules/custom/digest/src/Plugin/QueueWorker/DigestSendQueue.php on line 84 in Drupal\digest\Entity\Digest->send() (line 228 of modules/custom/digest/src/Entity/Digest.php). 
Drupal\digest\Entity\Digest->send(NULL) (Line: 84)
Drupal\digest\Plugin\QueueWorker\DigestSendQueue->processItem(Array) (Line: 182)
Drupal\Core\Cron->processQueues() (Line: 147)
Drupal\Core\Cron->run() (Line: 75)
Drupal\Core\ProxyClass\Cron->run() (Line: 65)
Drupal\automated_cron\EventSubscriber\AutomatedCron->onTerminate(Object, 'kernel.terminate', Object)
call_user_func(Array, Object, 'kernel.terminate', Object) (Line: 142)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.terminate') (Line: 100)
Symfony\Component\HttpKernel\HttpKernel->terminate(Object, Object) (Line: 32)
Stack\StackedHttpKernel->terminate(Object, Object) (Line: 686)
Drupal\Core\DrupalKernel->terminate(Object, Object) (Line: 22)