[Bug]: OCA\Files\Notification\Notifier::prepare() threw \InvalidArgumentException which is deprecated.

⚠️ 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 the update from 33.0.6 -> 33.0.7 to 34.0.2, I repeatedly get the following warnings in the logs:

{"reqId":"TIQ0PU9r4mlD3A5ogy85",
"level":2,
"time":"2026-07-24T09:29:34+00:00",
"remoteAddr":"***",
"user":"***",
"app":"no app in context",
"method":"GET","url":"/ocs/v2.php/apps/notifications/api/v2/notifications",
"scriptName":"/ocs/v2.php","message":"OCA\\Files\\Notification\\Notifier::prepare() threw \\InvalidArgumentException which is deprecated. Throw \\OCP\\Notification\\UnknownNotificationException when the notification is not known to your notifier and otherwise handle all \\InvalidArgumentException yourself.",
"userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.36",
"version":"34.0.2.1",
"data":[],
"id":"6a634cf9a1570"}

Steps to reproduce

I only see the warnings in the logs, caused by some user's action. I can't tell right now how to reproduce this warning.

Expected behavior

No warnings in logs.

Nextcloud Server version

34

Operating system

Other

PHP engine version

PHP 8.5

Web server

Apache (supported)

Database engine version

PostgreSQL

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

Upgraded to a MAJOR version (ex. 31 to 32)

Are you using the Nextcloud Server Encryption module?

Encryption is Disabled

What user-backends are you using?

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

Configuration report

{
    "system": {
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "***REMOVED SENSITIVE VALUE***"
        ],
        "serverid": 1,
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "pgsql",
        "default_phone_region": "DE",
        "version": "34.0.2.1",
        "overwrite.cli.url": "***REMOVED SENSITIVE VALUE***",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "skeletondirectory": "",
        "memcache.local": "\\OC\\Memcache\\APCu",
        "memcache.distributed": "\\OC\\Memcache\\Redis",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "filelocking.enabled": true,
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 0,
            "dbindex": 0,
            "timeout": 0
        },
        "session_lifetime": 3600,
        "session_keepalive": false,
        "tempdirectory": "\/srv\/nextcloud-temp",
        "remember_login_cookie_lifetime": 0,
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "smtp",
        "mail_sendmailmode": "smtp",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "25",
        "maintenance": false,
        "theme": "",
        "loglevel": 1,
        "log.condition": {
            "apps": [
                "admin_audit"
            ]
        },
        "default_language": "en",
        "default_locale": "en_GB",
        "knowledgebaseenabled": false,
        "simpleSignUpLink.shown": false,
        "auth.webauthn.enabled": false,
        "updater.release.channel": "stable",
        "trashbin_retention_obligation": "auto, 7",
        "versions_retention_obligation": "auto, 7",
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "maintenance_window_start": 2,
        "enable_previews": true,
        "preview_max_filesize_image": 100,
        "preview_max_x": 1024,
        "preview_max_y": 1024,
        "forbidden_filename_basenames": [
            "con",
            "prn",
            "aux",
            "nul",
            "com0",
            "com1",
            "com2",
            "com3",
            "com4",
            "com5",
            "com6",
            "com7",
            "com8",
            "com9",
            "com\u00b9",
            "com\u00b2",
            "com\u00b3",
            "lpt0",
            "lpt1",
            "lpt2",
            "lpt3",
            "lpt4",
            "lpt5",
            "lpt6",
            "lpt7",
            "lpt8",
            "lpt9",
            "lpt\u00b9",
            "lpt\u00b2",
            "lpt\u00b3"
        ],
        "forbidden_filename_characters": [
            "<",
            ">",
            ":",
            "\"",
            "|",
            "?",
            "*",
            "\\",
            "\/"
        ],
        "forbidden_filename_extensions": [
            " ",
            ".",
            ".filepart",
            ".part"
        ],
        "files.chunked_upload.max_size": 0,
        "profile.enabled": false,
        "app_install_overwrite": [],
        "twofactor_enforced": "true",
        "twofactor_enforced_groups": [],
        "twofactor_enforced_excluded_groups": [],
        "updater.secret": "***REMOVED SENSITIVE VALUE***"
    }
}

List of activated Apps

Enabled:
  - activity: 7.0.0
  - admin_audit: 1.24.0
  - announcementcenter: 7.4.1
  - appstore: 1.0.0
  - bruteforcesettings: 7.0.0
  - cloud_federation_api: 1.18.0
  - comments: 1.24.0
  - contactsinteraction: 1.15.0
  - dav: 1.39.0
  - federatedfilesharing: 1.24.0
  - files: 2.6.0
  - files_downloadlimit: 5.2.0
  - files_lock: 34.0.1
  - files_pdfviewer: 7.0.0-dev.0
  - files_reminders: 1.7.0
  - files_sharing: 1.26.0
  - files_trashbin: 1.24.0
  - files_versions: 1.27.0
  - impersonate: 5.0.0
  - logreader: 7.0.0
  - lookup_server_connector: 1.22.0
  - nextcloud_announcements: 6.0.0
  - notifications: 7.0.0-dev.1
  - oauth2: 1.22.0
  - office: 1.0.0
  - ownershiptransfer: 1.5.0
  - password_policy: 6.0.0-dev.0
  - photos: 7.0.0
  - privacy: 6.0.0-dev.1
  - profile: 1.3.0
  - provisioning_api: 1.24.0
  - quota_warning: 1.24.0
  - related_resources: 5.0.0-dev.0
  - serverinfo: 6.0.0
  - settings: 1.17.0
  - sharebymail: 1.24.0
  - support: 6.0.0
  - survey_client: 6.0.0-dev.0
  - systemtags: 1.24.0
  - theming: 2.9.0
  - twofactor_admin: 4.12.0
  - twofactor_backupcodes: 1.23.0
  - twofactor_totp: 16.0.0
  - updatenotification: 1.24.0
  - viewer: 7.0.0-dev.0
  - webhook_listeners: 1.6.0
  - workflowengine: 2.16.0
Disabled:
  - app_api: 34.0.0 (installed 32.0.0)
  - checksum: 2.1.2 (installed 2.1.2)
  - circles: 34.0.0 (installed 22.1.1)
  - contacts: 8.7.4 (installed 8.7.4)
  - dashboard: 7.14.0 (installed 7.0.0)
  - encryption: 2.22.0
  - federation: 1.24.0 (installed 1.10.1)
  - files_automatedtagging: 4.0.0 (installed 4.0.0)
  - files_external: 1.26.0
  - firstrunwizard: 7.0.0-dev.0 (installed 2.9.0)
  - previewgenerator: 5.14.0 (installed 5.14.0)
  - recommendations: 7.0.0 (installed 0.8.0)
  - suspicious_login: 12.0.0-dev.0
  - testing: 1.23.0
  - text: 8.0.0 (installed 3.1.0)
  - theming_customcss: 1.20.0 (installed 1.20.0)
  - twofactor_nextcloud_notification: 8.0.0
  - user_ldap: 1.25.0
  - user_status: 1.14.0 (installed 1.0.1)
  - weather_status: 1.14.0 (installed 1.0.0)

Nextcloud Signing status

No errors have been found.

Nextcloud Logs

see above

Additional info

No response

Start by locating OCA\Files\Notification\Notifier::prepare() and trace how it handles the notification reached through /ocs/v2.php/apps/notifications/api/v2/notifications. Confirm the relevant notification path and verify that the deprecated warning no longer appears in the logs while unknown notifications are handled as described in the warning.