Notification::setUser(): Argument #1 ($user) must be of type string, null given

[nickvergessen]

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OC\Notification\Notification::setUser(): Argument #1 ($user) must be of type string, null given, called in …/lib/Controller/PageController.php on line 171

From prod

[nickvergessen]

$user = $this->userSession->getUser();
if (!$user instanceof IUser) {

was not matching, but $this->userId is null …

->setUser($this->userId)

sure...