@dansup it was! But... I just tried registering another user and same deal:

[2019-06-20 04:36:31] production.ERROR: Trying to get property 'id' of non-object {"userId":2,"exception":"[object] (ErrorException(code: 0): Trying to get property 'id' of non-object at /var/www/mnphotos/app/Listeners/AuthLogin.php:127)