[Bug]: ValueError while running the setup check after upgrade to 31.0.7

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

After updating to version 31.0.7 from 31.0.5, the following "red" error appears on the "settings/admin/overview" page:

An exception occured while running the setup check: ValueError: Unknown format specifier "n" in /home/oc/ssd/html/lib/private/L10N/L10NString.php:68 Stack trace: #0 /home/oc/ssd/html/lib/private/L10N/L10NString.php(68): vsprintf() #1 /home/oc/ssd/html/lib/private/L10N/L10N.php(107): OC\L10N\L10NString->__toString() #2 /home/oc/ssd/html/lib/private/L10N/LazyL10N.php(38): OC\L10N\L10N->n() #3 /home/oc/ssd/html/apps/user_ldap/lib/SetupChecks/LdapConnection.php(87): OC\L10N\LazyL10N->n() #4 /home/oc/ssd/html/lib/private/SetupCheck/SetupCheckManager.php(34): OCA\User_LDAP\SetupChecks\LdapConnection->run() #5 /home/oc/ssd/html/apps/settings/lib/Controller/CheckSetupController.php(134): OC\SetupCheck\SetupCheckManager->runAll() #6 /home/oc/ssd/html/lib/private/AppFramework/Http/Dispatcher.php(200): OCA\Settings\Controller\CheckSetupController->check() #7 /home/oc/ssd/html/lib/private/AppFramework/Http/Dispatcher.php(114): OC\AppFramework\Http\Dispatcher->executeController() #8 /home/oc/ssd/html/lib/private/AppFramework/App.php(161): OC\AppFramework\Http\Dispatcher->dispatch() #9 /home/oc/ssd/html/lib/private/Route/Router.php(315): OC\AppFramework\App::main() #10 /home/oc/ssd/html/lib/base.php(1040): OC\Route\Router->match() #11 /home/oc/ssd/html/index.php(24): OC::handleRequest() #12 {main}

Steps to reproduce

1. Login and go to "settings/admin/overview" page.

Expected behavior

This error shouldn't occur and hasn't occurred before. The only change is an updated NC version.

Nextcloud Server version

31

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.3

Web server

Apache (supported)

Database engine version

MariaDB

Is this bug present after an update or on a fresh install?

Updated from a MINOR version (ex. 32.0.1 to 32.0.2)

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

{
    "system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "[redacted]",
            "[redacted]"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "overwrite.cli.url": "https:\/\/[redacted]",
        "dbtype": "mysql",
        "version": "31.0.7.1",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "logtimezone": "Europe\/Warsaw",
        "installed": true,
        "memcache.local": "\\OC\\Memcache\\APCu",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 0
        },
        "filelocking.enabled": true,
        "memcache.distributed": "\\OC\\Memcache\\Redis",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "loglevel": "2",
        "mail_smtpmode": "smtp",
        "mail_smtpsecure": "ssl",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "465",
        "mail_smtpauth": 1,
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "maintenance": false,
        "theme": "",
        "mail_smtpauthtype": "LOGIN",
        "files_external_allow_create_new_local": "true",
        "log_type": "file",
        "logfile": "\/var\/log\/nextcloud\/nextcloud.log",
        "logdateformat": "F d, Y H:i:s",
        "user.search_min_length": "3",
        "htaccess.RewriteBase": "\/",
        "enabledPreviewProviders": [
            "OC\\Preview\\SGI",
            "OC\\Preview\\Heic",
            "OC\\Preview\\BMP",
            "OC\\Preview\\GIF",
            "OC\\Preview\\JPEG",
            "OC\\Preview\\MarkDown",
            "OC\\Preview\\PNG",
            "OC\\Preview\\PDF",
            "OC\\Preview\\TXT",
            "OC\\Preview\\XBitmap"
        ],
        "allow_user_to_change_mail_address": "",
        "updatechecker": true,
        "updater.server.url": "***REMOVED SENSITIVE VALUE***",
        "preview_max_dimensions": "6016x4000",
        "encryption.use_legacy_base64_encoding": false,
        "encryption.key_storage_migrated": false,
        "mysql.utf8mb4": true,
        "default_phone_region": "PL",
        "maintenance_window_start": 1,
        "ldapProviderFactory": "OCA\\User_LDAP\\LDAPProviderFactory"
    }
}

List of activated Apps

Enabled:
  - activity: 4.0.0
  - admin_audit: 1.21.0
  - app_api: 5.0.2
  - bruteforcesettings: 4.0.0
  - camerarawpreviews: 0.8.7
  - circles: 31.0.0
  - cloud_federation_api: 1.14.0
  - comments: 1.21.0
  - contactsinteraction: 1.12.0
  - dashboard: 7.11.0
  - dav: 1.33.0
  - deck: 1.15.1
  - external: 6.0.2
  - federatedfilesharing: 1.21.0
  - federation: 1.21.0
  - files: 2.3.1
  - files_downloadlimit: 4.0.0
  - files_external: 1.23.0
  - files_pdfviewer: 4.0.0
  - files_reminders: 1.4.0
  - files_sharing: 1.23.1
  - files_trashbin: 1.21.0
  - files_versions: 1.24.0
  - firstrunwizard: 4.0.0
  - logreader: 4.0.0
  - lookup_server_connector: 1.19.0
  - music: 2.2.0
  - nextcloud_announcements: 3.0.0
  - notifications: 4.0.0
  - oauth2: 1.19.1
  - password_policy: 3.0.0
  - photos: 4.0.0
  - privacy: 3.0.0
  - profile: 1.0.0
  - provisioning_api: 1.21.0
  - recommendations: 4.0.0
  - related_resources: 2.0.0
  - serverinfo: 3.0.0
  - settings: 1.14.0
  - sharebymail: 1.21.0
  - support: 3.0.0
  - survey_client: 3.0.0
  - systemtags: 1.21.1
  - tasks: 0.16.1
  - text: 5.0.0
  - theming: 2.6.1
  - twofactor_backupcodes: 1.20.0
  - twofactor_totp: 13.0.0-dev.0
  - updatenotification: 1.21.0
  - user_ldap: 1.22.0
  - user_status: 1.11.0
  - viewer: 4.0.0
  - weather_status: 1.11.0
  - webhook_listeners: 1.2.0
  - workflowengine: 2.13.0
Disabled:
  - encryption: 2.19.0 (installed 2.18.0)
  - extract: 1.3.6 (installed 1.3.6)
  - files_clipboard: 0.7.1 (installed 1.0.3)
  - files_external_dropbox: 1.4.3 (installed 2.0.1)
  - files_rightclick: 0.15.1 (installed 1.6.0)
  - files_texteditor: 2.15.1 (installed 2.15.1)
  - onlyoffice: 9.8.0 (installed 9.8.0)
  - snappymail: 2.38.2 (installed 2.38.2)
  - suspicious_login: 9.0.1
  - twofactor_nextcloud_notification: 5.0.0
  - user_external: 3.4.0 (installed 3.4.0)

Nextcloud Signing status

No errors have been found.

Nextcloud Logs

{"reqId":"aIYWYB4lZpjHabUUp4o70gAAAAs","level":3,"time":"2025-07-27T14:06:58+02:00","remoteAddr":"<some_ip>","user":"<me>","app":"no app in context","method":"GET","url":"/settings/ajax/checksetup","message":"Exception running check OCA\\User_LDAP\\SetupChecks\\LdapConnection: Unknown format specifier \"n\"","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:141.0) Gecko/20100101 Firefox/141.0","version":"31.0.7.1","exception":{"Exception":"ValueError","Message":"Unknown format specifier \"n\"","Code":0,"Trace":[{"file":"/home/oc/ssd/html/lib/private/L10N/L10NString.php","line":68,"function":"vsprintf"},{"file":"/home/oc/ssd/html/lib/private/L10N/L10N.php","line":107,"function":"__toString","class":"OC\\L10N\\L10NString","type":"->"},{"file":"/home/oc/ssd/html/lib/private/L10N/LazyL10N.php","line":38,"function":"n","class":"OC\\L10N\\L10N","type":"->"},{"file":"/home/oc/ssd/html/apps/user_ldap/lib/SetupChecks/LdapConnection.php","line":87,"function":"n","class":"OC\\L10N\\LazyL10N","type":"->"},{"file":"/home/oc/ssd/html/lib/private/SetupCheck/SetupCheckManager.php","line":34,"function":"run","class":"OCA\\User_LDAP\\SetupChecks\\LdapConnection","type":"->"},{"file":"/home/oc/ssd/html/apps/settings/lib/Controller/CheckSetupController.php","line":134,"function":"runAll","class":"OC\\SetupCheck\\SetupCheckManager","type":"->"},{"file":"/home/oc/ssd/html/lib/private/AppFramework/Http/Dispatcher.php","line":200,"function":"check","class":"OCA\\Settings\\Controller\\CheckSetupController","type":"->"},{"file":"/home/oc/ssd/html/lib/private/AppFramework/Http/Dispatcher.php","line":114,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/home/oc/ssd/html/lib/private/AppFramework/App.php","line":161,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/home/oc/ssd/html/lib/private/Route/Router.php","line":315,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/home/oc/ssd/html/lib/base.php","line":1040,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/home/oc/ssd/html/index.php","line":24,"function":"handleRequest","class":"OC","type":"::"}],"File":"/home/oc/ssd/html/lib/private/L10N/L10NString.php","Line":68,"message":"Exception running check OCA\\User_LDAP\\SetupChecks\\LdapConnection: Unknown format specifier \"n\"","exception":[],"CustomMessage":"Exception running check OCA\\User_LDAP\\SetupChecks\\LdapConnection: Unknown format specifier \"n\""},"id":"68861b5d6a4cb"}

Additional info

No response

Start with apps/user_ldap/lib/SetupChecks/LdapConnection.php at the call reported on line 87, then inspect the formatting path through lib/private/L10N/L10N.php, lib/private/L10N/L10NString.php, and lib/private/L10N/LazyL10N.php. Reproduce the setup check from settings/admin/overview and verify it completes without the Unknown format specifier "n" error.