TYPO3 Core

On a TYPO3 7.6.10 instance I cannot create scheduler tasks. Whenever trying to save a new scheduler task, I get an exception:

Call to a member function getNotificationEmail() on null
Error thrown in file
/var/www/site/htdocs/typo3_src/typo3/sysext/reports/Classes/Task/SystemStatusUpdateTaskNotificationEmailField.php in line 49.

called in TYPO3\CMS\Scheduler\Controller\SchedulerModuleController::editTaskAction()
$additionalFields = $providerObject->getAdditionalFields($taskInfo, null, $this);

SystemStatusUpdateTaskNotificationEmailField gets called with a null task, but it unconditionally calls $task->getNotificationEmail().