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example
Or for longer, use three backticks above and below the code snippet:
longer
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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, 20.0.5): Nextcloud Hub 4 (26.0.0)
Operating system and version (eg, Ubuntu 20.04): Ubuntu 20.04 on LXC in Proxmox Linux 5.15.85-1-pve x86_64
Apache or nginx version (eg, Apache 2.4.25): Nginx 1.18.0
PHP version (eg, 7.4): 8.1.17
The issue you are facing:
Every 6 to 7 hours, the nextcloud cron job, which runs every 5 minutes, generate this error:
Subject: Cron www-data@Nextcloud php --define apc.enable_cli=1 -f /var/www/nextcloud/cron.php
Message:
Error: Call to a member function mkdir() on null in /var/www/nextcloud/lib/private/Files/SetupManager.php:265
Stack trace:
#0 /var/www/nextcloud/lib/private/Files/SetupManager.php(325): OC\Files\SetupManager->oneTimeUserSetup()
#1 /var/www/nextcloud/lib/private/Files/SetupManager.php(229): OC\Files\SetupManager->setupForUserWith()
#2 /var/www/nextcloud/lib/private/legacy/OC_Util.php(112): OC\Files\SetupManager->setupForUser()
#3 /var/www/nextcloud/lib/private/Files/Utils/Scanner.php(113): OC_Util::setupFS()
#4 /var/www/nextcloud/lib/private/Files/Utils/Scanner.php(155): OC\Files\Utils\Scanner->getMounts()
#5 /var/www/nextcloud/apps/files/lib/BackgroundJob/ScanFiles.php(76): OC\Files\Utils\Scanner->backgroundScan()
#6 /var/www/nextcloud/apps/files/lib/BackgroundJob/ScanFiles.php(113): OCA\Files\BackgroundJob\ScanFiles->runScanner()
#7 /var/www/nextcloud/lib/public/BackgroundJob/Job.php(78): OCA\Files\BackgroundJob\ScanFiles->run()
#8 /var/www/nextcloud/lib/public/BackgroundJob/TimedJob.php(103): OCP\BackgroundJob\Job->start()
#9 /var/www/nextcloud/lib/public/BackgroundJob/TimedJob.php(93): OCP\BackgroundJob\TimedJob->start()
#10 /var/www/nextcloud/cron.php(152): OCP\BackgroundJob\TimedJob->execute()
#11 {main}
My Nextcloud installation is just for family with very limited users (currently 2, including me) and I have not noticed any apparent issues from this.
However, it would be great if we could get this resolved and this error stop popping up.
Unfortunately, I am not able to say when it started, I had mis-configured the alerting and thus, was not receiving this, or any.
Is this the first time you’ve seen this error? (Y/N): N
Steps to replicate it:
- Let nextcloud brackground cron job work as per configuration recommendation
- Receive the error every 6 to 7 hours
The output of your Nextcloud log in Admin > Logging:
Error: Call to a member function mkdir() on null in /var/www/nextcloud/lib/private/Files/SetupManager.php:265
Stack trace:
#0 /var/www/nextcloud/lib/private/Files/SetupManager.php(325): OC\Files\SetupManager->oneTimeUserSetup()
#1 /var/www/nextcloud/lib/private/Files/SetupManager.php(229): OC\Files\SetupManager->setupForUserWith()
#2 /var/www/nextcloud/lib/private/legacy/OC_Util.php(112): OC\Files\SetupManager->setupForUser()
#3 /var/www/nextcloud/lib/private/Files/Utils/Scanner.php(113): OC_Util::setupFS()
#4 /var/www/nextcloud/lib/private/Files/Utils/Scanner.php(155): OC\Files\Utils\Scanner->getMounts()
#5 /var/www/nextcloud/apps/files/lib/BackgroundJob/ScanFiles.php(76): OC\Files\Utils\Scanner->backgroundScan()
#6 /var/www/nextcloud/apps/files/lib/BackgroundJob/ScanFiles.php(113): OCA\Files\BackgroundJob\ScanFiles->runScanner()
#7 /var/www/nextcloud/lib/public/BackgroundJob/Job.php(78): OCA\Files\BackgroundJob\ScanFiles->run()
#8 /var/www/nextcloud/lib/public/BackgroundJob/TimedJob.php(103): OCP\BackgroundJob\Job->start()
#9 /var/www/nextcloud/lib/public/BackgroundJob/TimedJob.php(93): OCP\BackgroundJob\TimedJob->start()
#10 /var/www/nextcloud/cron.php(152): OCP\BackgroundJob\TimedJob->execute()
#11 {main}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'hidden',
'passwordsalt' => 'hidden',
'secret' => 'hidden',
'trusted_domains' =>
array (
0 => 'hidden',
),
'trusted_proxies' =>
array (
0 => 'hidden',
),
'datadirectory' => '/media/nextcloud/data',
'dbtype' => 'mysql',
'version' => '26.0.0.11',
'overwrite.cli.url' => 'hidden',
'dbname' => 'nextcloud',
'dbhost' => 'hidden',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'hidden',
'dbpassword' => 'hidden',
'installed' => true,
'defaultapp' => 'files',
'auth.bruteforce.protection.enabled' => true,
'forwarded_for_headers' =>
array (
0 => 'HTTP_X_FORWARDED',
1 => 'HTTP_FORWARDED_FOR',
),
'mail_domain' => 'hidden',
'mail_from_address' => 'nextcloud',
'mail_smtphost' => 'hidden',
'mail_smtpport' => 25,
'overwriteprotocol' => 'https',
'log_type' => 'syslog',
'logfile' => '',
'loglevel' => 0,
'logtimezone' => 'Pacific/Auckland',
'enable_previews' => true,
'enabledPreviewProviders' =>
array (
0 => 'OC\Preview\Image',
1 => 'OC\Preview\JPEG',
2 => 'OC\Preview\GIF',
3 => 'OC\Preview\PNG',
4 => 'OC\Preview\BMP',
5 => 'OC\Preview\XBitmap',
6 => 'OC\Preview\TIFF',
7 => 'OC\Preview\Movie',
8 => 'OC\\Preview\\HEIC',
9 => 'OC\\Preview\\AVI',
10 => 'OC\\Preview\\MP4',
11 => 'OC\\Preview\\MKV',
),
'preview_max_x' => '1024',
'preview_max_y' => '1024',
'jpeg_quality' => '60',
'preview_max_scale_factor' => 1,
'preview_max_memory' => 256,
'memcache.local' => '\OC\Memcache\APCu',
'memcache.distributed' => '\OC\Memcache\Redis',
'memcache.locking' => '\OC\Memcache\Redis',
'redis' =>
array (
'host' => '/var/run/redis/redis-server.sock',
'port' => 0,
'timeout' => 1.5,
'password' => '',
'dbindex' => 0,
),
'ldapIgnoreNamingRules' => false,
'ldapProviderFactory' => 'OCA\User_LDAP\LDAPProviderFactory',
'maintenance' => false,
'theme' => '',
'trashbin_retention_obligation' => 'auto, 90',
'app_install_overwrite' =>
array (
0 => 'joplin',
1 => 'files_frommail',
2 => 'cookbook',
3 => 'printer',
4 => 'apporder',
5 => 'bruteforcesettings',
6 => 'epubreader',
7 => 'music',
8 => 'onlyoffice',
9 => 'qownnotesapi',
10 => 'collectives',
),
'appstoreenabled' => 'true',
'default_phone_region' => 'NZ',
'default_locale' => 'en_NZ',
'updater.release.channel' => 'stable',
'memories.exiftool' => '/var/www/nextcloud/apps/memories/exiftool-bin/exiftool-amd64-glibc',
'memories.ffmpeg_path' => '/usr/bin/ffmpeg',
'memories.ffprobe_path' => '/usr/bin/ffprobe',
'memories.transcoder' => '/var/www/nextcloud/apps/memories/exiftool-bin/go-vod-amd64',
'memories.no_transcode' => false,
'memories.qsv' => false,
);
The output of your Apache/nginx/system log in /var/log/____:
no error in nginx error log (which is logical as this is run directly via PHP
Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.
This log file does not exist on my setup