Object for placeholder pollTitle is invalid

[michel-thomas]

⚠️ 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?

Hello,

I face this Object for placeholder pollTitle is invalid in logs and I read #3926 issue. But this is not described how to repair old entries.

What did you expect, how polls should behave instead?

Could you please give us a tip (SQL request or whatever) to correct old entries that still use wrong object type?

What steps does it need to replay this bug?

1. upgrade app
2. some old entries generates logs

Affected polls version

8.6.2

Installation method

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

Installation type

Updated from a minor version within same major version (i.e. 8.0.0 to 8.1.2)

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

Additional client environment information

No response

NC version

Nextcloud 31

Other Nextcloud version

No response

PHP engine version

PHP 8.3

Other PHP version

No response

Database engine

MariaDB

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

{
    "reqId": "kMVFcVowkf1PTT0SDxHy",
    "level": 3,
    "time": "2026-01-07T15:15:37+01:00",
    "remoteAddr": "80.13.247.75",
    "user": "Ana",
    "app": "polls",
    "method": "GET",
    "url": "/ocs/v2.php/apps/activity/api/v2/activity/polls?format=json&since=0&limit=50&object_type=poll&object_id=74",
    "message": "Activity event had invalid subject parameters provided [app: polls, subject: vote_set]",
    "userAgent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36",
    "version": "31.0.8.1",
    "exception": {
        "Exception": "OCP\\RichObjectStrings\\InvalidObjectExeption",
        "Message": "Object for placeholder pollTitle is invalid, value 57 for key id is not a string",
        "Code": 0,
        "Trace": [
            {
                "file": "/srv/cloud.domain.tld/lib/private/RichObjectStrings/Validator.php",
                "line": 59,
                "function": "validateParameter",
                "class": "OC\\RichObjectStrings\\Validator",
                "type": "->"
            },
            {
                "file": "/srv/cloud.domain.tld/apps/activity/lib/GroupHelper.php",
                "line": 83,
                "function": "validate",
                "class": "OC\\RichObjectStrings\\Validator",
                "type": "->"
            },
            {
                "file": "/srv/cloud.domain.tld/apps/activity/lib/GroupHelper.php",
                "line": 47,
                "function": "addEvent",
                "class": "OCA\\Activity\\GroupHelper",
                "type": "->"
            },
            {
                "file": "/srv/cloud.domain.tld/apps/activity/lib/Data.php",
                "line": 232,
                "function": "addActivity",
                "class": "OCA\\Activity\\GroupHelper",
                "type": "->"
            },
            {
                "file": "/srv/cloud.domain.tld/apps/activity/lib/Controller/APIv2Controller.php",
                "line": 190,
                "function": "get",
                "class": "OCA\\Activity\\Data",
                "type": "->"
            },
            {
                "file": "/srv/cloud.domain.tld/apps/activity/lib/Controller/APIv2Controller.php",
                "line": 137,
                "function": "get",
                "class": "OCA\\Activity\\Controller\\APIv2Controller",
                "type": "->"
            },
            {
                "file": "/srv/cloud.domain.tld/lib/private/AppFramework/Http/Dispatcher.php",
                "line": 200,
                "function": "getFilter",
                "class": "OCA\\Activity\\Controller\\APIv2Controller",
                "type": "->"
            },
            {
                "file": "/srv/cloud.domain.tld/lib/private/AppFramework/Http/Dispatcher.php",
                "line": 114,
                "function": "executeController",
                "class": "OC\\AppFramework\\Http\\Dispatcher",
                "type": "->"
            },
            {
                "file": "/srv/cloud.domain.tld/lib/private/AppFramework/App.php",
                "line": 161,
                "function": "dispatch",
                "class": "OC\\AppFramework\\Http\\Dispatcher",
                "type": "->"
            },
            {
                "file": "/srv/cloud.domain.tld/lib/private/Route/Router.php",
                "line": 315,
                "function": "main",
                "class": "OC\\AppFramework\\App",
                "type": "::"
            },
            {
                "file": "/srv/cloud.domain.tld/ocs/v1.php",
                "line": 49,
                "function": "match",
                "class": "OC\\Route\\Router",
                "type": "->"
            },
            {
                "file": "/srv/cloud.domain.tld/ocs/v2.php",
                "line": 7,
                "args": [
                    "/srv/cloud.domain.tld/ocs/v1.php"
                ],
                "function": "require_once"
            }
        ],
        "File": "/srv/cloud.domain.tld/lib/private/RichObjectStrings/Validator.php",
        "Line": 85,
        "message": "Activity event had invalid subject parameters provided [app: polls, subject: vote_set]",
        "exception": [],
        "CustomMessage": "Activity event had invalid subject parameters provided [app: polls, subject: vote_set]"
    },
    "id": "695e784536ca9"
}

Additional environment informations

No response

Configuration report

List of activated Apps

Nextcloud Signing status

Additional Information

Thank you

[dartcafe]

I would suspect old activity items related to Polls. If you do not need them anymore, you can remove all entries for the app polls from the oc_activity table.

It would be easier for me to know the table content.

[dartcafe]

@michel-thomas Just dug into some records.

The table oc_activity has a column subjectparams. Entries for the app polls have something like

{
    "pollTitle": {
        "type": "highlight",
        "id": "57",
        "name": "dartcafe",
        "link": "https:\/\/nc.foo.com\/apps\/polls\/vote\/57"
    }
}

In your case, the key id seems to contain a numeric value, while it has to be a string.

So in your db it may look like

{
    "pollTitle": {
        "type": "highlight",
        "id": 57,  <--- Change it to a string by putting quotation marks around the value
        "name": "dartcafe",
        "link": "https:\/\/nc.foo.com\/apps\/polls\/vote\/57"
    }
}