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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 below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 12.0.2): 13.0.6.1
Operating system and version (eg, Ubuntu 17.04): Ubuntu 18.04
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.29
PHP version (eg, 7.1): 7.2.13 (I did try reverting to 7.1 but that did not help)
The issue you are facing:
the web updater no longer appears inside nextcloud. I used it to upgrade to 13.0.6 but it is not showing in the admin. I do get notices in my nextcloud client that new versions are available(currently 14.0.4
Is this the first time you’ve seen this error? (Y/N):Y
Steps to replicate it:
- log into nextcloud and go to settings, basic settings
The output of your Nextcloud log in Admin > Logging:
Only one error entry in the log from the past month. I did redact my domain name in the log.
{"reqId":"QA7PCymOd5DyIIdWKtuc","level":4,"time":"2018-12-31T11:22:06+00:00","remoteAddr":"IP","user":"deb","app":"webdav","method":"MKCOL","url":"\/remote.php\/dav\/files\/deb\/Desktop\/%20%20%20%20%20%20%20%20%20%20%20","message":"Exception: {\"Exception\":\"OCA\\\\DAV\\\\Connector\\\\Sabre\\\\Exception\\\\InvalidPath\",\"Message\":\"Empty filename is not allowed\",\"Code\":0,\"Trace\":\"#0 \\\/var\\\/www\\\/vhosts\\\/domain.com\\\/cloud.domain.com\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(1178): OCA\\\\DAV\\\\Connector\\\\Sabre\\\\Directory->getChild(' ')\\n#1 \\\/var\\\/www\\\/vhosts\\\/domain.com\\\/cloud.domain.com\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/CorePlugin.php(594): Sabre\\\\DAV\\\\Server->createCollection('files\\\/deb\\\/Deskt...', Object(Sabre\\\\DAV\\\\MkCol))\\n#2 [internal function]: Sabre\\\\DAV\\\\CorePlugin->httpMkcol(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#3 \\\/var\\\/www\\\/vhosts\\\/domain.com\\\/cloud.domain.com\\\/3rdparty\\\/sabre\\\/event\\\/lib\\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\\n#4 \\\/var\\\/www\\\/vhosts\\\/domain.com\\\/cloud.domain.com\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(479): Sabre\\\\Event\\\\EventEmitter->emit('method:MKCOL', Array)\\n#5 \\\/var\\\/www\\\/vhosts\\\/domain.com\\\/cloud.domain.com\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(254): Sabre\\\\DAV\\\\Server->invokeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#6 \\\/var\\\/www\\\/vhosts\\\/domain.com\\\/cloud.domain.com\\\/apps\\\/dav\\\/lib\\\/Server.php(293): Sabre\\\\DAV\\\\Server->exec()\\n#7 \\\/var\\\/www\\\/vhosts\\\/domain.com\\\/cloud.domain.com\\\/apps\\\/dav\\\/appinfo\\\/v2\\\/remote.php(35): OCA\\\\DAV\\\\Server->exec()\\n#8 \\\/var\\\/www\\\/vhosts\\\/domain.com\\\/cloud.domain.com\\\/remote.php(164): require_once('\\\/var\\\/www\\\/vhosts...')\\n#9 {main}\",\"File\":\"\\\/var\\\/www\\\/vhosts\\\/domain.com\\\/cloud.domain.com\\\/apps\\\/dav\\\/lib\\\/Connector\\\/Sabre\\\/Directory.php\",\"Line\":227}","userAgent":"Mozilla\/5.0 (Linux) mirall\/2.3.3 (Nextcloud)","version":"13.0.6.1"}
The output of your config.php file in `/path/to/nextcloud` (make sure you remove any identifiable information!):
