Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the following as you can (you can cut and paste this into your topic):
Nextcloud version (eg, 10.0.2): 12.0.1 RC4
Operating system and version (eg, Ubuntu 16.04): Ubuntu 16.04
Apache or nginx version (eg, Apache 2.4.25): apache
PHP version (eg, 5.6): 7.0.2.2
Is this the first time you’ve seen this error?: No but first time reporting
Can you reliably replicate it? (If so, please outline steps): No but it logs every couple of seconds or so it seems
The issue you are facing:
Our log is being flooded with:
Fatal webdav Sabre\DAV\Exception\ServiceUnavailable: TypeError: Argument 1 passed to OC\Authentication\TwoFactorAuth\Manager::isTwoFactorAuthenticated() must be an instance of OCP\IUser, null given, called in /var/www/nextcloud/lib/private/User/Session.php on line 453
[internal function] {closure}(Object(Sabre\HTTP\Request), Object(Sabre\HTTP\Response))
/var/www/nextcloud/3rdparty/sabre/event/lib/EventEmitterTrait.php - line 105: call_user_func_array(Object(Closure), Array)
/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 466: Sabre\Event\EventEmitter->emit(‘beforeMethod’, Array)
/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 254: Sabre\DAV\Server->invokeMethod(Object(Sabre\HTTP\Request), Object(Sabre\HTTP\Response))
/var/www/nextcloud/remote.php - line 70: Sabre\DAV\Server->exec()
/var/www/nextcloud/remote.php - line 167: handleException(Object(TypeError))
{main}
The output of your Nextcloud log in Admin > Logging:
This would be a spamming of the above error for days
…
‘trusted_domains’ =>
array (
0 => ‘digitalfile.domain1.com’,
1 => ‘digital.domain2.com’,
),
‘datadirectory’ => ‘/var/www/nextcloud-data’,
‘overwrite.cli.url’ => ‘http://digital.domain2.com’,
‘dbtype’ => ‘mysql’,
‘version’ => ‘12.0.1.3’,
‘dbname’ => ‘nextcloud’,
‘dbhost’ => ‘localhost’,
‘dbport’ => ‘’,
‘dbtableprefix’ => ‘oc_’,
‘dbuser’ => ‘nextclouduser’,
‘dbpassword’ => ‘***********’,
‘logtimezone’ => ‘UTC’,
‘installed’ => true,
‘memcache.distributed’ => ‘\OC\Memcache\Redis’,
‘memcache.local’ => ‘\OC\Memcache\Redis’,
‘memcache.locking’ => ‘\OC\Memcache\Redis’,
‘redis’ =>
array (
‘host’ => ‘localhost’,
‘port’ => 6379,
),
‘ldapIgnoreNamingRules’ => false,
‘ldapProviderFactory’ => ‘\OCA\User_LDAP\LDAPProviderFactory’,
‘updater.release.channel’ => ‘daily’,
‘maintenance’ => false,
‘theme’ => ‘’,
‘loglevel’ => 2,
‘mail_smtpmode’ => ‘smtp’,
‘mail_smtpauthtype’ => ‘LOGIN’,
‘mail_from_address’ => ‘digital-file-transfer’,
‘mail_domain’ => ‘domain1,com’,
‘mail_smtphost’ => ‘smtp.office365.com’,
‘mail_smtpport’ => ‘587’,
‘mail_smtpsecure’ => ‘tls’,
‘mail_smtpauth’ => 1,
‘mail_smtpname’ => ‘user@domain1.com’,
‘mail_smtppassword’ => ‘**********’,
);
m.