[Bug]: Call to a member function getUID() on null

⚠️ 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

Call to a member function getUID() on null

https://github.com/nextcloud/server/blob/43aa92f6c3972e17830747de5a3859b4d5d0e536/apps/files/lib/Controller/ViewController.php#L148

The method is likely being accessed in a context where no user is logged in, such as sessions expired, or a public share link or an API call without proper authentication. The #[NoCSRFRequired] attribute suggests this endpoint might be designed to handle such cases, but the code assumes a user is always present (other functions in the same also behave the same way).

Steps to reproduce

The method is likely being accessed in a context where no user is logged in, such as sessions expired, or a public share link or an API call without proper authentication.

Expected behavior

Null user properly handled.

Nextcloud Server version

30

Operating system

None

PHP engine version

PHP 8.3

Web server

None

Database engine version

None

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

None

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

List of activated Apps

Nextcloud Signing status

Nextcloud Logs

{
  "reqId": "1sJI6BX4bnpv9Hm9f30g",
  "level": 3,
  "time": "2025-08-07T13:38:37+02:00",
  "user": "--",
  "app": "index",
  "method": "GET",
  "url": "/apps/files/",
  "message": "Call to a member function getUID() on null in file '/var/www/nextcloud/apps/files/lib/Controller/ViewController.php' line 145",
  "userAgent": "Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Mobile Safari/537.36",
  "version": "30.0.13.1",
  "exception": {
    "Exception": "Exception",
    "Message": "Call to a member function getUID() on null in file '/var/www/nextcloud/apps/files/lib/Controller/ViewController.php' line 145",
    "Code": 0,
    "Trace": [
      {
        "file": "/var/www/nextcloud/lib/private/AppFramework/App.php",
        "line": 161,
        "function": "dispatch",
        "class": "OC\\AppFramework\\Http\\Dispatcher",
        "type": "->",
        "args": [
          {
            "__class__": "OCA\\Files\\Controller\\ViewController"
          },
          "index"
        ]
      },
      {
        "file": "/var/www/nextcloud/lib/private/Route/Router.php",
        "line": 303,
        "function": "main",
        "class": "OC\\AppFramework\\App",
        "type": "::",
        "args": [
          "OCA\\Files\\Controller\\ViewController",
          "index",
          {
            "__class__": "OC\\AppFramework\\DependencyInjection\\DIContainer"
          },
          {
            "_route": "files.view.index"
          }
        ]
      },
      {
        "file": "/var/www/nextcloud/lib/base.php",
        "line": 1010,
        "function": "match",
        "class": "OC\\Route\\Router",
        "type": "->",
        "args": [
          "/apps/files/"
        ]
      },
      {
        "file": "/var/www/nextcloud/index.php",
        "line": 24,
        "function": "handleRequest",
        "class": "OC",
        "type": "::",
        "args": []
      }
    ],
    "File": "/var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php",
    "Line": 146,
    "Previous": {
      "Exception": "Error",
      "Message": "Call to a member function getUID() on null",
      "Code": 0,
      "Trace": [
        {
          "file": "/var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php",
          "line": 208,
          "function": "index",
          "class": "OCA\\Files\\Controller\\ViewController",
          "type": "->",
          "args": [
            "",
            "",
            null
          ]
        },
        {
          "file": "/var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php",
          "line": 114,
          "function": "executeController",
          "class": "OC\\AppFramework\\Http\\Dispatcher",
          "type": "->",
          "args": [
            {
              "__class__": "OCA\\Files\\Controller\\ViewController"
            },
            "index"
          ]
        },
        {
          "file": "/var/www/nextcloud/lib/private/AppFramework/App.php",
          "line": 161,
          "function": "dispatch",
          "class": "OC\\AppFramework\\Http\\Dispatcher",
          "type": "->",
          "args": [
            {
              "__class__": "OCA\\Files\\Controller\\ViewController"
            },
            "index"
          ]
        },
        {
          "file": "/var/www/nextcloud/lib/private/Route/Router.php",
          "line": 303,
          "function": "main",
          "class": "OC\\AppFramework\\App",
          "type": "::",
          "args": [
            "OCA\\Files\\Controller\\ViewController",
            "index",
            {
              "__class__": "OC\\AppFramework\\DependencyInjection\\DIContainer"
            },
            {
              "_route": "files.view.index"
            }
          ]
        },
        {
          "file": "/var/www/nextcloud/lib/base.php",
          "line": 1010,
          "function": "match",
          "class": "OC\\Route\\Router",
          "type": "->",
          "args": [
            "/apps/files/"
          ]
        },
        {
          "file": "/var/www/nextcloud/index.php",
          "line": 24,
          "function": "handleRequest",
          "class": "OC",
          "type": "::",
          "args": []
        }
      ],
      "File": "/var/www/nextcloud/apps/files/lib/Controller/ViewController.php",
      "Line": 145
    },
    "message": "Call to a member function getUID() on null in file '/var/www/nextcloud/apps/files/lib/Controller/ViewController.php' line 145",
    "exception": [],
    "CustomMessage": "Call to a member function getUID() on null in file '/var/www/nextcloud/apps/files/lib/Controller/ViewController.php' line 145"
  },
  "id": "6894a24d08ca4"
}

Additional info

No response

Start with apps/files/lib/Controller/ViewController.php around lines 145-148 and inspect the index action called by GET /apps/files/. Use the provided log and no-authentication scenario as the starting point, then verify the request no longer raises a getUID() on null error when no user is present.