New User Creation Fails

Steps to reproduce

Configure SAML to auto-create users
Create new user in IdP (https://goauthentik.io)
New user fails authentication with internal server error

Expected behaviour

Tell us what should happen

User account is created according to SAML attributes. (I've verified that the settings are being carried over owing to the fact that my SAML account is getting updated when I change a value)

Actual behaviour

Tell us what happens instead

User is greeted with "Internal Server Error" page upon successful IdP authentication.

Server configuration

Operating system: Ubuntu 20.04

Web server: Nginx

Database: MariaDB

PHP version: 7.4.3

Nextcloud version: (see Nextcloud admin page) 22.1.0

Where did you install Nextcloud from: Web Installer

List of activated apps:

Enabled:
  - accessibility: 1.7.0
  - activity: 2.15.0
  - admin_audit: 1.11.0
  - announcementcenter: 6.0.0
  - approval: 1.0.7
  - bruteforcesettings: 2.2.0
  - calendar: 2.3.4
  - cloud_federation_api: 1.4.0
  - comments: 1.11.0
  - customproperties: 2.0.4
  - dashboard: 7.1.0
  - data_request: 1.9.0
  - dav: 1.18.0
  - deck: 1.5.3
  - event_update_notification: 1.3.0
  - external: 3.9.0
  - federatedfilesharing: 1.11.0
  - files: 1.16.0
  - files_accesscontrol: 1.12.0
  - files_antivirus: 3.2.2
  - files_automatedtagging: 1.12.0
  - files_downloadactivity: 1.11.1
  - files_pdfviewer: 2.3.0
  - files_rightclick: 1.1.0
  - files_sharing: 1.13.2
  - files_trackdownloads: 1.11.0
  - files_trashbin: 1.11.0
  - files_versions: 1.14.0
  - files_videoplayer: 1.11.0
  - fileslibreofficeedit: 1.0.2
  - firstrunwizard: 2.11.0
  - flow_notifications: 1.2.0
  - forms: 2.3.0
  - group_everyone: 0.1.8
  - groupfolders: 10.0.0
  - guests: 2.0.2
  - logreader: 2.7.0
  - lookup_server_connector: 1.9.0
  - nextcloud_announcements: 1.11.0
  - notes: 4.1.1
  - notifications: 2.10.1
  - oauth2: 1.9.0
  - password_policy: 1.12.0
  - passwords: 2021.10.20
  - polls: 3.2.0
  - privacy: 1.6.0
  - provisioning_api: 1.11.0
  - quota_warning: 1.11.0
  - ransomware_protection: 1.11.0
  - serverinfo: 1.12.0
  - settings: 1.3.0
  - sharebymail: 1.11.0
  - systemtags: 1.11.0
  - tasks: 0.14.2
  - text: 3.3.0
  - theming: 1.12.0
  - twofactor_admin: 3.1.0
  - twofactor_backupcodes: 1.10.1
  - twofactor_nextcloud_notification: 3.2.1
  - twofactor_totp: 6.1.0
  - twofactor_u2f: 6.2.0
  - updatenotification: 1.11.0
  - user_retention: 1.5.0
  - user_saml: 4.1.1
  - user_status: 1.1.1
  - viewer: 1.6.0
  - weather_status: 1.1.0
  - workflow_ocr: 1.22.1
  - workflow_pdf_converter: 1.7.0
  - workflow_script: 1.7.0
  - workflowengine: 2.3.0

Nextcloud configuration:

{
    "system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "cloud.tapple.world"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "22.1.0.1",
        "overwrite.cli.url": "https:\/\/cloud.tapple.world",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "mail_smtpmode": "smtp",
        "mail_smtpsecure": "ssl",
        "mail_sendmailmode": "smtp",
        "mail_smtpauthtype": "LOGIN",
        "app_install_overwrite": [
            "announcementcenter",
            "groupfolders"
        ],
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpauth": 1,
        "mail_smtpport": "465",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "maintenance": false,
        "theme": "",
        "loglevel": 2,
        "updater.secret": "***REMOVED SENSITIVE VALUE***"
    }
}

Logs

Nextcloud log (data/owncloud.log)

{
  "reqId": "TY55E4Sx4BT8HsCdPkGy",
  "level": 3,
  "time": "2021-10-04T19:30:15+00:00",
  "remoteAddr": "[REDACTED]",
  "user": "--",
  "app": "index",
  "method": "POST",
  "url": "/apps/user_saml/saml/acs",
  "message": "An exception occurred while executing a query: SQLSTATE[HY000]: General error: 1364 Field 'displayname' doesn't have a default value",
  "userAgent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.61 Safari/537.36",
  "version": "22.1.0.1",
  "exception": {
    "Exception": "Doctrine\\DBAL\\Exception\\NotNullConstraintViolationException",
    "Message": "An exception occurred while executing a query: SQLSTATE[HY000]: General error: 1364 Field 'displayname' doesn't have a default value",
    "Code": 1364,
    "Trace": [
      {
        "file": "/var/www/cloud/3rdparty/doctrine/dbal/src/Connection.php",
        "line": 1728,
        "function": "convert",
        "class": "Doctrine\\DBAL\\Driver\\API\\MySQL\\ExceptionConverter",
        "type": "->"
      },
      {
        "file": "/var/www/cloud/3rdparty/doctrine/dbal/src/Connection.php",
        "line": 1667,
        "function": "handleDriverException",
        "class": "Doctrine\\DBAL\\Connection",
        "type": "->"
      },
      {
        "file": "/var/www/cloud/3rdparty/doctrine/dbal/src/Connection.php",
        "line": 1146,
        "function": "convertExceptionDuringQuery",
        "class": "Doctrine\\DBAL\\Connection",
        "type": "->"
      },
      {
        "file": "/var/www/cloud/lib/private/DB/Connection.php",
        "line": 262,
        "function": "executeStatement",
        "class": "Doctrine\\DBAL\\Connection",
        "type": "->"
      },
      {
        "file": "/var/www/cloud/3rdparty/doctrine/dbal/src/Query/QueryBuilder.php",
        "line": 213,
        "function": "executeStatement",
        "class": "OC\\DB\\Connection",
        "type": "->"
      },
      {
        "file": "/var/www/cloud/lib/private/DB/QueryBuilder/QueryBuilder.php",
        "line": 287,
        "function": "execute",
        "class": "Doctrine\\DBAL\\Query\\QueryBuilder",
        "type": "->"
      },
      {
        "file": "/var/www/cloud/apps/user_saml/lib/UserBackend.php",
        "line": 144,
        "function": "execute",
        "class": "OC\\DB\\QueryBuilder\\QueryBuilder",
        "type": "->"
      },
      {
        "file": "/var/www/cloud/apps/user_saml/lib/Controller/SAMLController.php",
        "line": 156,
        "function": "createUserIfNotExists",
        "class": "OCA\\User_SAML\\UserBackend",
        "type": "->"
      },
      {
        "file": "/var/www/cloud/apps/user_saml/lib/Controller/SAMLController.php",
        "line": 335,
        "function": "autoprovisionIfPossible",
        "class": "OCA\\User_SAML\\Controller\\SAMLController",
        "type": "->"
      },
      {
        "file": "/var/www/cloud/lib/private/AppFramework/Http/Dispatcher.php",
        "line": 217,
        "function": "assertionConsumerService",
        "class": "OCA\\User_SAML\\Controller\\SAMLController",
        "type": "->"
      },
      {
        "file": "/var/www/cloud/lib/private/AppFramework/Http/Dispatcher.php",
        "line": 126,
        "function": "executeController",
        "class": "OC\\AppFramework\\Http\\Dispatcher",
        "type": "->"
      },
      {
        "file": "/var/www/cloud/lib/private/AppFramework/App.php",
        "line": 156,
        "function": "dispatch",
        "class": "OC\\AppFramework\\Http\\Dispatcher",
        "type": "->"
      },
      {
        "file": "/var/www/cloud/lib/private/Route/Router.php",
        "line": 301,
        "function": "main",
        "class": "OC\\AppFramework\\App",
        "type": "::"
      },
      {
        "file": "/var/www/cloud/lib/base.php",
        "line": 1000,
        "function": "match",
        "class": "OC\\Route\\Router",
        "type": "->"
      },
      {
        "file": "/var/www/cloud/index.php",
        "line": 36,
        "function": "handleRequest",
        "class": "OC",
        "type": "::"
      }
    ],
    "File": "/var/www/cloud/3rdparty/doctrine/dbal/src/Driver/API/MySQL/ExceptionConverter.php",
    "Line": 111,
    "Previous": {
      "Exception": "Doctrine\\DBAL\\Driver\\PDO\\Exception",
      "Message": "SQLSTATE[HY000]: General error: 1364 Field 'displayname' doesn't have a default value",
      "Code": 1364,
      "Trace": [
        {
          "file": "/var/www/cloud/3rdparty/doctrine/dbal/src/Driver/PDO/Statement.php",
          "line": 84,
          "function": "new",
          "class": "Doctrine\\DBAL\\Driver\\PDO\\Exception",
          "type": "::"
        },
        {
          "file": "/var/www/cloud/3rdparty/doctrine/dbal/src/Connection.php",
          "line": 1136,
          "function": "execute",
          "class": "Doctrine\\DBAL\\Driver\\PDO\\Statement",
          "type": "->"
        },
        {
          "file": "/var/www/cloud/lib/private/DB/Connection.php",
          "line": 262,
          "function": "executeStatement",
          "class": "Doctrine\\DBAL\\Connection",
          "type": "->"
        },
        {
          "file": "/var/www/cloud/3rdparty/doctrine/dbal/src/Query/QueryBuilder.php",
          "line": 213,
          "function": "executeStatement",
          "class": "OC\\DB\\Connection",
          "type": "->"
        },
        {
          "file": "/var/www/cloud/lib/private/DB/QueryBuilder/QueryBuilder.php",
          "line": 287,
          "function": "execute",
          "class": "Doctrine\\DBAL\\Query\\QueryBuilder",
          "type": "->"
        },
        {
          "file": "/var/www/cloud/apps/user_saml/lib/UserBackend.php",
          "line": 144,
          "function": "execute",
          "class": "OC\\DB\\QueryBuilder\\QueryBuilder",
          "type": "->"
        },
        {
          "file": "/var/www/cloud/apps/user_saml/lib/Controller/SAMLController.php",
          "line": 156,
          "function": "createUserIfNotExists",
          "class": "OCA\\User_SAML\\UserBackend",
          "type": "->"
        },
        {
          "file": "/var/www/cloud/apps/user_saml/lib/Controller/SAMLController.php",
          "line": 335,
          "function": "autoprovisionIfPossible",
          "class": "OCA\\User_SAML\\Controller\\SAMLController",
          "type": "->"
        },
        {
          "file": "/var/www/cloud/lib/private/AppFramework/Http/Dispatcher.php",
          "line": 217,
          "function": "assertionConsumerService",
          "class": "OCA\\User_SAML\\Controller\\SAMLController",
          "type": "->"
        },
        {
          "file": "/var/www/cloud/lib/private/AppFramework/Http/Dispatcher.php",
          "line": 126,
          "function": "executeController",
          "class": "OC\\AppFramework\\Http\\Dispatcher",
          "type": "->"
        },
        {
          "file": "/var/www/cloud/lib/private/AppFramework/App.php",
          "line": 156,
          "function": "dispatch",
          "class": "OC\\AppFramework\\Http\\Dispatcher",
          "type": "->"
        },
        {
          "file": "/var/www/cloud/lib/private/Route/Router.php",
          "line": 301,
          "function": "main",
          "class": "OC\\AppFramework\\App",
          "type": "::"
        },
        {
          "file": "/var/www/cloud/lib/base.php",
          "line": 1000,
          "function": "match",
          "class": "OC\\Route\\Router",
          "type": "->"
        },
        {
          "file": "/var/www/cloud/index.php",
          "line": 36,
          "function": "handleRequest",
          "class": "OC",
          "type": "::"
        }
      ],
      "File": "/var/www/cloud/3rdparty/doctrine/dbal/src/Driver/PDO/Exception.php",
      "Line": 26,
      "Previous": {
        "Exception": "PDOException",
        "Message": "SQLSTATE[HY000]: General error: 1364 Field 'displayname' doesn't have a default value",
        "Code": "HY000",
        "Trace": [
          {
            "file": "/var/www/cloud/3rdparty/doctrine/dbal/src/Driver/PDO/Statement.php",
            "line": 82,
            "function": "execute",
            "class": "PDOStatement",
            "type": "->"
          },
          {
            "file": "/var/www/cloud/3rdparty/doctrine/dbal/src/Connection.php",
            "line": 1136,
            "function": "execute",
            "class": "Doctrine\\DBAL\\Driver\\PDO\\Statement",
            "type": "->"
          },
          {
            "file": "/var/www/cloud/lib/private/DB/Connection.php",
            "line": 262,
            "function": "executeStatement",
            "class": "Doctrine\\DBAL\\Connection",
            "type": "->"
          },
          {
            "file": "/var/www/cloud/3rdparty/doctrine/dbal/src/Query/QueryBuilder.php",
            "line": 213,
            "function": "executeStatement",
            "class": "OC\\DB\\Connection",
            "type": "->"
          },
          {
            "file": "/var/www/cloud/lib/private/DB/QueryBuilder/QueryBuilder.php",
            "line": 287,
            "function": "execute",
            "class": "Doctrine\\DBAL\\Query\\QueryBuilder",
            "type": "->"
          },
          {
            "file": "/var/www/cloud/apps/user_saml/lib/UserBackend.php",
            "line": 144,
            "function": "execute",
            "class": "OC\\DB\\QueryBuilder\\QueryBuilder",
            "type": "->"
          },
          {
            "file": "/var/www/cloud/apps/user_saml/lib/Controller/SAMLController.php",
            "line": 156,
            "function": "createUserIfNotExists",
            "class": "OCA\\User_SAML\\UserBackend",
            "type": "->"
          },
          {
            "file": "/var/www/cloud/apps/user_saml/lib/Controller/SAMLController.php",
            "line": 335,
            "function": "autoprovisionIfPossible",
            "class": "OCA\\User_SAML\\Controller\\SAMLController",
            "type": "->"
          },
          {
            "file": "/var/www/cloud/lib/private/AppFramework/Http/Dispatcher.php",
            "line": 217,
            "function": "assertionConsumerService",
            "class": "OCA\\User_SAML\\Controller\\SAMLController",
            "type": "->"
          },
          {
            "file": "/var/www/cloud/lib/private/AppFramework/Http/Dispatcher.php",
            "line": 126,
            "function": "executeController",
            "class": "OC\\AppFramework\\Http\\Dispatcher",
            "type": "->"
          },
          {
            "file": "/var/www/cloud/lib/private/AppFramework/App.php",
            "line": 156,
            "function": "dispatch",
            "class": "OC\\AppFramework\\Http\\Dispatcher",
            "type": "->"
          },
          {
            "file": "/var/www/cloud/lib/private/Route/Router.php",
            "line": 301,
            "function": "main",
            "class": "OC\\AppFramework\\App",
            "type": "::"
          },
          {
            "file": "/var/www/cloud/lib/base.php",
            "line": 1000,
            "function": "match",
            "class": "OC\\Route\\Router",
            "type": "->"
          },
          {
            "file": "/var/www/cloud/index.php",
            "line": 36,
            "function": "handleRequest",
            "class": "OC",
            "type": "::"
          }
        ],
        "File": "/var/www/cloud/3rdparty/doctrine/dbal/src/Driver/PDO/Statement.php",
        "Line": 82
      }
    },
    "CustomMessage": "--"
  }
}

nextcloud / user_saml