/apps/polls/list/relevant Cannot assign null to property OCA\Polls\Model\User\User::$user

[skatedeluxe]

⚠️ 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 (I've searched it).
• I agree to follow Nextcloud's Code of Conduct.

What went wrong, what did you observe?

This affects only one user. No polls for the user are listet when open the overview site.

What did you expect, how polls should behave instead?

List all my and shared polls.

What steps does it need to replay this bug?

Just open the URL /apps/polls/list/relevant

Affected polls version

8.5.0

Installation method

Installed/updated from the appstore (Apps section of your site)

Installation type

First time installation

Can you rule out that any extension you use is involved in the issue?

• I have checked all browser extension

Which browser did you use, when experiencing the bug?

• Firefox
• Chrome
• Chromium/Chromium based (i.e. Edge)
• Safari
• Other/Don't know

Other browser

No response

Add your browser log here

Roh-Protokolleintrag

{
 "reqId": "jGOgAg7BsMXJxnmdxXPB",
 "level": 3,
 "time": "2025-11-24T10:37:38+00:00",
 "remoteAddr": "xxxxx",
 "user": "xxxx",
 "app": "index",
 "method": "GET",
 "url": "/index.php/apps/polls/polls?time=1763980658750",
 "message": "Cannot assign null to property OCA\\Polls\\Model\\User\\User::$user of type OCP\\IUser",
 "userAgent": "Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0",
 "version": "31.0.11.2",
 "exception": {
   "Exception": "TypeError",
   "Message": "Cannot assign null to property OCA\\Polls\\Model\\User\\User::$user of type OCP\\IUser",
   "Code": 0,
   "Trace": [
     {
       "file": "/opt/www/nextcloud/apps/polls/lib/Model/User/User.php",
       "line": 34,
       "function": "setUp",
       "class": "OCA\\Polls\\Model\\User\\User",
       "type": "->"
     },
     {
       "file": "/opt/www/nextcloud/apps/polls/lib/Db/UserMapper.php",
       "line": 187,
       "function": "__construct",
       "class": "OCA\\Polls\\Model\\User\\User",
       "type": "->"
     },
     {
       "file": "/opt/www/nextcloud/apps/polls/lib/Db/UserMapper.php",
       "line": 129,
       "function": "getUserObject",
       "class": "OCA\\Polls\\Db\\UserMapper",
       "type": "->"
     },
     {
       "file": "/opt/www/nextcloud/apps/polls/lib/Db/UserMapper.php",
       "line": 69,
       "function": "getUserFromShare",
       "class": "OCA\\Polls\\Db\\UserMapper",
       "type": "->"
     },
     {
       "file": "/opt/www/nextcloud/apps/polls/lib/Db/EntityWithUser.php",
       "line": 110,
       "function": "getParticipant",
       "class": "OCA\\Polls\\Db\\UserMapper",
       "type": "->"
     },
     {
       "file": "/opt/www/nextcloud/apps/polls/lib/Db/Poll.php",
       "line": 224,
       "function": "getUser",
       "class": "OCA\\Polls\\Db\\EntityWithUser",
       "type": "->"
     },
     {
       "function": "jsonSerialize",
       "class": "OCA\\Polls\\Db\\Poll",
       "type": "->"
     },
     {
       "file": "/opt/www/nextcloud/lib/public/AppFramework/Http/JSONResponse.php",
       "line": 63,
       "function": "json_encode"
     },
     {
       "file": "/opt/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php",
       "line": 159,
       "function": "render",
       "class": "OCP\\AppFramework\\Http\\JSONResponse",
       "type": "->"
     },
     {
       "file": "/opt/www/nextcloud/lib/private/AppFramework/App.php",
       "line": 161,
       "function": "dispatch",
       "class": "OC\\AppFramework\\Http\\Dispatcher",
       "type": "->"
     },
     {
       "file": "/opt/www/nextcloud/lib/private/Route/Router.php",
       "line": 315,
       "function": "main",
       "class": "OC\\AppFramework\\App",
       "type": "::"
     },
     {
       "file": "/opt/www/nextcloud/lib/base.php",
       "line": 1063,
       "function": "match",
       "class": "OC\\Route\\Router",
       "type": "->"
     },
     {
       "file": "/opt/www/nextcloud/index.php",
       "line": 24,
       "function": "handleRequest",
       "class": "OC",
       "type": "::"
     }
   ],
   "File": "/opt/www/nextcloud/apps/polls/lib/Model/User/User.php",
   "Line": 42,
   "message": "Cannot assign null to property OCA\\Polls\\Model\\User\\User::$user of type OCP\\IUser",
   "exception": [],
   "CustomMessage": "Cannot assign null to property OCA\\Polls\\Model\\User\\User::$user of type OCP\\IUser"
 },
 "id": "6924359ad5c6f"

Additional client environment information

We use LDAP as backend.
All other apps work for the user.
Changed owner of the polls in the mysql database and they are shown in the other users account.
There was also a bug, but i can't open: #2944
Also updated from 30 to 31

NC version

Nextcloud 31

Other Nextcloud version

31.0.11

PHP engine version

PHP 8.2

Other PHP version

No response

Database engine

MySQL

Database Engine version or other Database

No response

Which user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other/Don't know

Add your nextcloud server log here

Additional environment informations

No response

Configuration report

{
    "system": {
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "allow_local_remote_servers": "1",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "cloud.dpop.eu",
            "cloud.intern.skatedeluxe.de"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "overwrite.cli.url": "https:\/\/cloud.dpop.eu",
        "overwritehost": "cloud.dpop.eu",
        "overwriteprotocol": "https",
        "trusted_proxies": "***REMOVED SENSITIVE VALUE***",
        "forwarded_for_headers": [
            "HTTP_X_FORWARDED_FOR",
            "HTTP_X_FORWARDED"
        ],
        "lost_password_link": "disabled",
        "simpleSignUpLink.shown": false,
        "auth.bruteforce.protection.enabled": true,
        "dbtype": "mysql",
        "version": "31.0.11.2",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "logtimezone": "UTC",
        "installed": true,
        "filelocking.enabled": true,
        "memcache.local": "\\OC\\Memcache\\APCu",
        "memcache.distributed": "\\OC\\Memcache\\Redis",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 0,
            "dbindex": 0,
            "timeout": 0
        },
        "ldapIgnoreNamingRules": true,
        "tempdirectory": "\/opt\/www\/nextcloud\/data\/uploads_tmp",
        "maintenance": false,
        "maintenance_window_start": 1,
        "loglevel": 3,
        "trashbin_retention_obligation": "60",
        "ldapProviderFactory": "\\OCA\\User_LDAP\\LDAPProviderFactory",
        "mail_smtpmode": "sendmail",
        "mail_sendmailmode": "smtp",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "465",
        "theme": "",
        "mysql.utf8mb4": true,
        "default_phone_region": "DE",
        "skeletondirectory": "",
        "share_folder": "\/shared",
        "app_install_overwrite": [
            "announcementcenter",
            "initialcheck",
            "defaultlinkopen",
            "activitylog",
            "sip_trip_phone",
            "impersonate",
            "video_converter"
        ],
        "updater.release.channel": "stable",
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "enable_previews": true,
        "enabledPreviewProviders": [
            "OC\\Preview\\Movie",
            "OC\\Preview\\SVG",
            "OC\\Preview\\Image",
            "OC\\Preview\\Photoshop",
            "OC\\Preview\\PNG",
            "OC\\Preview\\JPEG",
            "OC\\Preview\\GIF",
            "OC\\Preview\\BMP",
            "OC\\Preview\\XBitmap",
            "OC\\Preview\\TIFF",
            "OC\\Preview\\HEIC",
            "OC\\Preview\\TXT",
            "OC\\Preview\\PDF",
            "OC\\Preview\\OpenDocument",
            "OC\\Preview\\MSOffice2003",
            "OC\\Preview\\MSOfficeDoc",
            "OC\\Preview\\Markdown",
            "OC\\Preview\\Imaginary"
        ],
        "preview_imaginary_url": "***REMOVED SENSITIVE VALUE***",
        "preview_max_x": 2048,
        "preview_max_y": 2048,
        "jpeg_quality": 60,
        "memories.exiftool": "\/opt\/www\/nextcloud\/apps\/memories\/bin-ext\/exiftool-amd64-glibc",
        "memories.vod.path": "\/opt\/www\/nextcloud\/apps\/memories\/bin-ext\/go-vod-amd64",
        "memories.vod.ffmpeg": "\/usr\/bin\/ffmpeg",
        "memories.vod.ffprobe": "\/usr\/bin\/ffprobe",
        "forbidden_filename_basenames": [
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        "forbidden_filename_extensions": [
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        ],
        "files.chunked_upload.max_size": 20971520
    }   
}

List of activated Apps

Enabled:
  - activity: 4.0.0
  - admin_audit: 1.21.0
  - announcementcenter: 7.2.2
  - app_api: 5.0.2
  - audioplayer: 3.6.1
  - bruteforcesettings: 4.0.0
  - circles: 31.0.0
  - cloud_federation_api: 1.14.0
  - comments: 1.21.0
  - contactsinteraction: 1.12.1
  - dashboard: 7.11.0
  - dav: 1.33.0
  - drawio: 3.1.2
  - federatedfilesharing: 1.21.0
  - federation: 1.21.0
  - files: 2.3.1
  - files_downloadlimit: 4.0.0
  - files_pdfviewer: 4.0.0
  - files_reminders: 1.4.0
  - files_sharing: 1.23.2
  - files_trashbin: 1.21.0
  - files_versions: 1.24.0
  - groupfolders: 19.1.10
  - impersonate: 2.0.0
  - integration_openproject: 2.10.1
  - logreader: 4.0.0
  - lookup_server_connector: 1.19.0
  - memories: 7.7.0
  - metadata: 0.23.0
  - nextcloud_announcements: 3.0.0
  - notes: 4.12.4
  - notifications: 4.0.0
  - oauth2: 1.19.1
  - onlyoffice: 9.11.0
  - password_policy: 3.0.0
  - photos: 4.0.0
  - polls: 8.5.0
  - 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
  - spreed: 21.1.5
  - survey_client: 3.0.0
  - systemtags: 1.21.1
  - text: 5.0.2
  - theming: 2.6.1
  - theming_customcss: 1.19.0
  - 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
  - files_external: 1.23.0 (installed 1.6.0)
  - files_rightclick: 0.15.1 (installed 1.6.0)
  - firstrunwizard: 4.0.0 (installed 2.4.0)
  - piwik: 0.13.0 (installed 0.13.0)
  - richdocuments: 8.5.11 (installed 8.5.11)
  - sharebymail: 1.21.0 (installed 1.5.0)
  - sharelisting: 1.3.0 (installed 1.3.0)
  - sharerenamer: 3.5.0 (installed 3.5.0)
  - support: 3.0.0 (installed 1.8.0)
  - suspicious_login: 9.0.1
  - twofactor_nextcloud_notification: 5.0.0
  - workflow_media_converter: 1.15.1 (installed 1.15.1)

Nextcloud Signing status

No errors have been found.

Additional Information

No response

[skatedeluxe]

Is there any news?
What can i do, to resolve the issue?

[dartcafe]

Sorry, but I am just busy with other (personal) things and work. I will have a look.

[dartcafe]

From what I see there seems to be the following combination:
A poll participant is an internal user and is invited by share. But it seems, the user cannot be loaded from the user base anymore.

• The share type is 'user' (which means an internal user)
• but the user does not exist anymore

How can this happen?
I would assume a user got removed or renamed at the LDAP side causing the inconsistency.

Actually the app fails when trying to get the user from Nextcloud's user manager.

The only action I can take is, to catch this and return a "Deleted User". But normally this situation should not happen.

Or some very different unexpected situation exists.

[skatedeluxe]

Hi,

thanks for the reply. When i change oc_polls_polls owner in the mysql db from the affected user A to another user B, the polls were shown in users B list. That's why i can't understand what the problem should be with a deleted user.

-How can i check which deleted or renamed user is the causing the problem?
-Should i check oc_polls_share?

Thanks in advanced.
Jan

[dartcafe]

The error ist thrown here:

polls/lib/Model/User/User.php

Line 42 in 80a10c9

$this->user = Container::queryClass(IUserManager::class)->get($this->id);

If I change the line to

		$this->user = null;

I get TypeError Cannot assign null to property OCA\Polls\Model\User\User::$user of type OCP\IUser.

That means, the requested user does not exist. But in contrast to my prior assumption, this is not caused by a participant, but by an invalid poll owner.