Dropbox Integration Unstable?

ℹ️ Support
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Support intro

Sorry to hear you’re facing problems. :slightly_frowning_face:

The community help forum (help.nextcloud.com) is for home and non-enterprise users. Support is provided by other community members on a best effort / “as available” basis. All of those responding are volunteering their time to help you.

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Getting help

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The Basics

  • Nextcloud Server version:
    • Nextcloud 33.0.3
  • Operating system and version:
    • #1 SMP PREEMPT Debian 1:6.12.87-1+rpt1~bookworm (2026-05-12)
  • Web server and version:
    • Server version: Apache/2.4.67 (Debian)
  • Reverse proxy and version:
    • nginx version: openresty/1.27.1.2
  • PHP version:
    • PHP 8.4.21 (cli) (built: May 8 2026 19:26:29) (NTS)
  • Is this the first time you’ve seen this error? (Yes / No):
    • yes
  • When did this problem seem to first start?
    • recently
  • Installation method (e.g. AlO, NCP, Bare Metal/Archive, etc.)
    • OMV Container
  • Are you using CloudfIare, mod_security, or similar? (Yes / No)
    • No

Summary of the issues you are facing:

Cannot install dropbox because it makes Nextcloud unstable. How would I successfully install Dropbox Integration?

Steps to replicate it (hint: details matter!):

  1. Logon as administrator and navigate to Apps
  2. Under Integration locate Dropbox Integration
  3. An Error message is displayed

Log entries

Nextcloud

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/var/www/html/lib/private/Preview/Db/PreviewMapper.php(64): OCP\\AppFramework\\Db\\QBMapper->insert(Object(OC\\Preview\\Db\\Preview))\\n#4 /var/www/html/lib/private/Preview/Generator.php(593): OC\\Preview\\Db\\PreviewMapper->insert(Object(OC\\Preview\\Db\\Preview))\\n#5 /var/www/html/lib/private/Preview/Generator.php(565): OC\\Preview\\Generator->savePreview(Object(OC\\Preview\\Db\\Preview), Object(OC\\Image))\\n#6 /var/www/html/lib/private/Preview/Generator.php(183): OC\\Preview\\Generator->generatePreview(Object(OC\\Files\\Node\\File), Object(OCP\\Image), 1024, 2279, false, 1116, 2484, NULL, true)\\n#7 /var/www/html/lib/private/Preview/Generator.php(94): OC\\Preview\\Generator->generatePreviews(Object(OC\\Files\\Node\\File), Array, 'image/png', true)\\n#8 /var/www/html/lib/private/PreviewManager.php(166): OC\\Preview\\Generator->getPreview(Object(OC\\Files\\Node\\File), 558, 1242, false, 'cover', NULL, true)\\n#9 /var/www/html/core/Controller/PreviewController.php(166): 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Object(OC\\AppFramework\\DependencyInjection\\DIContainer), Array)\\n#15 /var/www/html/lib/base.php(1155): OC\\Route\\Router->match('/core/preview')\\n#16 /var/www/html/index.php(25): OC::handleRequest()\\n#17 {main}\",\"previous\":{\"class\":\"Doctrine\\DBAL\\Exception\\UniqueConstraintViolationException\",\"message\":\"An exception occurred while executing a query: SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '221486-1024-2279-4-0--1' for key 'previews_file_uniq_idx'\",\"code\":1062,\"file\":\"/var/www/html/3rdparty/doctrine/dbal/src/Driver/API/MySQL/ExceptionConverter.php:64\",\"trace\":\"#0 /var/www/html/3rdparty/doctrine/dbal/src/Connection.php(1976): Doctrine\\DBAL\\Driver\\API\\MySQL\\ExceptionConverter->convert(Object(Doctrine\\DBAL\\Driver\\PDO\\Exception), Object(Doctrine\\DBAL\\Query))\\n#1 /var/www/html/3rdparty/doctrine/dbal/src/Connection.php(1918): Doctrine\\DBAL\\Connection->handleDriverException(Object(Doctrine\\DBAL\\Driver\\PDO\\Exception), 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/var/www/html/lib/private/Preview/Db/PreviewMapper.php(64): OCP\\AppFramework\\Db\\QBMapper->insert(Object(OC\\Preview\\Db\\Preview))\\n#9 /var/www/html/lib/private/Preview/Generator.php(593): OC\\Preview\\Db\\PreviewMapper->insert(Object(OC\\Preview\\Db\\Preview))\\n#10 /var/www/html/lib/private/Preview/Generator.php(565): OC\\Preview\\Generator->savePreview(Object(OC\\Preview\\Db\\Preview), Object(OC\\Image))\\n#11 /var/www/html/lib/private/Preview/Generator.php(183): OC\\Preview\\Generator->generatePreview(Object(OC\\Files\\Node\\File), Object(OCP\\Image), 1024, 2279, false, 1116, 2484, NULL, true)\\n#12 /var/www/html/lib/private/Preview/Generator.php(94): OC\\Preview\\Generator->generatePreviews(Object(OC\\Files\\Node\\File), Array, 'image/png', true)\\n#13 /var/www/html/lib/private/PreviewManager.php(166): OC\\Preview\\Generator->getPreview(Object(OC\\Files\\Node\\File), 558, 1242, false, 'cover', NULL, true)\\n#14 /var/www/html/core/Controller/PreviewController.php(166): 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Object(OC\\AppFramework\\DependencyInjection\\DIContainer), Array)\\n#20 /var/www/html/lib/base.php(1155): OC\\Route\\Router->match('/core/preview')\\n#21 /var/www/html/index.php(25): OC::handleRequest()\\n#22 {main}\",\"previous\":{\"class\":\"Doctrine\\DBAL\\Driver\\PDO\\Exception\",\"message\":\"SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '221486-1024-2279-4-0--1' for key 'previews_file_uniq_idx'\",\"code\":1062,\"file\":\"/var/www/html/3rdparty/doctrine/dbal/src/Driver/PDO/Exception.php:24\",\"trace\":\"#0 /var/www/html/3rdparty/doctrine/dbal/src/Driver/PDO/Statement.php(132): Doctrine\\DBAL\\Driver\\PDO\\Exception::new(Object(PDOException))\\n#1 /var/www/html/3rdparty/doctrine/dbal/src/Connection.php(1212): Doctrine\\DBAL\\Driver\\PDO\\Statement->execute()\\n#2 /var/www/html/3rdparty/doctrine/dbal/src/Connections/PrimaryReadReplicaConnection.php(292): Doctrine\\DBAL\\Connection->executeStatement('INSERT INTO `oc...', Array, Array)\\n#3 /var/www/html/lib/private/DB/Connection.php(467): Doctrine\\DBAL\\Connections\\PrimaryReadReplicaConnection->executeStatement('INSERT INTO `oc...', Array, Array)\\n#4 /var/www/html/lib/private/DB/ConnectionAdapter.php(67): OC\\DB\\Connection->executeStatement('INSERT INTO `oc...', Array, Array)\\n#5 /var/www/html/lib/private/DB/QueryBuilder/QueryBuilder.php(285): OC\\DB\\ConnectionAdapter->executeStatement('INSERT INTO `*P...', Array, Array)\\n#6 /var/www/html/lib/public/AppFramework/Db/QBMapper.php(128): OC\\DB\\QueryBuilder\\QueryBuilder->executeStatement()\\n#7 /var/www/html/lib/private/Preview/Db/PreviewMapper.php(64): OCP\\AppFramework\\Db\\QBMapper->insert(Object(OC\\Preview\\Db\\Preview))\\n#8 /var/www/html/lib/private/Preview/Generator.php(593): OC\\Preview\\Db\\PreviewMapper->insert(Object(OC\\Preview\\Db\\Preview))\\n#9 /var/www/html/lib/private/Preview/Generator.php(565): OC\\Preview\\Generator->savePreview(Object(OC\\Preview\\Db\\Preview), Object(OC\\Image))\\n#10 /var/www/html/lib/private/Preview/Generator.php(183): OC\\Preview\\Generator->generatePreview(Object(OC\\Files\\Node\\File), Object(OCP\\Image), 1024, 2279, false, 1116, 2484, NULL, true)\\n#11 /var/www/html/lib/private/Preview/Generator.php(94): OC\\Preview\\Generator->generatePreviews(Object(OC\\Files\\Node\\File), Array, 'image/png', true)\\n#12 /var/www/html/lib/private/PreviewManager.php(166): OC\\Preview\\Generator->getPreview(Object(OC\\Files\\Node\\File), 558, 1242, false, 'cover', NULL, true)\\n#13 /var/www/html/core/Controller/PreviewController.php(166): OC\\PreviewManager->getPreview(Object(OC\\Files\\Node\\File), 558, 1242, false, 'cover')\\n#14 /var/www/html/core/Controller/PreviewController.php(128): OC\\Core\\Controller\\PreviewController->fetchPreview(Object(OC\\Files\\Node\\File), 558, 1242, true, false, 'cover', false)\\n#15 /var/www/html/lib/private/AppFramework/Http/Dispatcher.php(205): OC\\Core\\Controller\\PreviewController->getPreviewByFileId(221486, 558, 1242, 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'previews_file_uniq_idx'\",\"code\":\"23000\",\"file\":\"/var/www/html/3rdparty/doctrine/dbal/src/Driver/PDO/Statement.php:130\",\"trace\":\"#0 /var/www/html/3rdparty/doctrine/dbal/src/Driver/PDO/Statement.php(130): PDOStatement->execute(NULL)\\n#1 /var/www/html/3rdparty/doctrine/dbal/src/Connection.php(1212): Doctrine\\DBAL\\Driver\\PDO\\Statement->execute()\\n#2 /var/www/html/3rdparty/doctrine/dbal/src/Connections/PrimaryReadReplicaConnection.php(292): Doctrine\\DBAL\\Connection->executeStatement('INSERT INTO `oc...', Array, Array)\\n#3 /var/www/html/lib/private/DB/Connection.php(467): Doctrine\\DBAL\\Connections\\PrimaryReadReplicaConnection->executeStatement('INSERT INTO `oc...', Array, Array)\\n#4 /var/www/html/lib/private/DB/ConnectionAdapter.php(67): OC\\DB\\Connection->executeStatement('INSERT INTO `oc...', Array, Array)\\n#5 /var/www/html/lib/private/DB/QueryBuilder/QueryBuilder.php(285): OC\\DB\\ConnectionAdapter->executeStatement('INSERT INTO `*P...', Array, Array)\\n#6 /var/www/html/lib/public/AppFramework/Db/QBMapper.php(128): OC\\DB\\QueryBuilder\\QueryBuilder->executeStatement()\\n#7 /var/www/html/lib/private/Preview/Db/PreviewMapper.php(64): OCP\\AppFramework\\Db\\QBMapper->insert(Object(OC\\Preview\\Db\\Preview))\\n#8 /var/www/html/lib/private/Preview/Generator.php(593): OC\\Preview\\Db\\PreviewMapper->insert(Object(OC\\Preview\\Db\\Preview))\\n#9 /var/www/html/lib/private/Preview/Generator.php(565): OC\\Preview\\Generator->savePreview(Object(OC\\Preview\\Db\\Preview), Object(OC\\Image))\\n#10 /var/www/html/lib/private/Preview/Generator.php(183): OC\\Preview\\Generator->generatePreview(Object(OC\\Files\\Node\\File), Object(OCP\\Image), 1024, 2279, false, 1116, 2484, NULL, true)\\n#11 /var/www/html/lib/private/Preview/Generator.php(94): OC\\Preview\\Generator->generatePreviews(Object(OC\\Files\\Node\\File), Array, 'image/png', true)\\n#12 /var/www/html/lib/private/PreviewManager.php(166): OC\\Preview\\Generator->getPreview(Object(OC\\Files\\Node\\File), 558, 1242, false, 'cover', NULL, true)\\n#13 /var/www/html/core/Controller/PreviewController.php(166): OC\\PreviewManager->getPreview(Object(OC\\Files\\Node\\File), 558, 1242, false, 'cover')\\n#14 /var/www/html/core/Controller/PreviewController.php(128): OC\\Core\\Controller\\PreviewController->fetchPreview(Object(OC\\Files\\Node\\File), 558, 1242, true, false, 'cover', false)\\n#15 /var/www/html/lib/private/AppFramework/Http/Dispatcher.php(205): OC\\Core\\Controller\\PreviewController->getPreviewByFileId(221486, 558, 1242, true, false, 'cover', false)\\n#16 /var/www/html/lib/private/AppFramework/Http/Dispatcher.php(118): OC\\AppFramework\\Http\\Dispatcher->executeController(Object(OC\\Core\\Controller\\PreviewController), 'getPreviewByFil...')\\n#17 /var/www/html/lib/private/AppFramework/App.php(153): OC\\AppFramework\\Http\\Dispatcher->dispatch(Object(OC\\Core\\Controller\\PreviewController), 'getPreviewByFil...')\\n#18 /var/www/html/lib/private/Route/Router.php(321): OC\\AppFramework\\App::main('OC\\\\Core\\\\Control...', 'getPreviewByFil...', Object(OC\\AppFramework\\DependencyInjection\\DIContainer), Array)\\n#19 /var/www/html/lib/base.php(1155): OC\\Route\\Router->match('/core/preview')\\n#20 /var/www/html/index.php(25): OC::handleRequest()\\n#21 {main}\"}}}}","CustomMessage":"An exception occurred while executing a query: SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '221486-1024-2279-4-0--1' for key 'previews_file_uniq_idx'"}}

Web Browser

Apps

Enabled:

  • activity: 6.0.0
  • admin_audit: 1.23.0
  • bookmarks: 16.1.4
  • brewmemo: 0.6.0
  • bruteforcesettings: 6.0.0
  • calendar: 6.4.1
  • camerarawpreviews: 0.9.0
  • circles: 33.0.0
  • cloud_federation_api: 1.17.0
  • comments: 1.23.0
  • contacts: 8.5.0
  • contactsinteraction: 1.14.1
  • cookbook: 0.11.6
  • dashboard: 7.13.0
  • dav: 1.36.0
  • encryption: 2.21.0
  • end_to_end_encryption: 2.1.1
  • federatedfilesharing: 1.23.0
  • federation: 1.23.0
  • files: 2.5.0
  • files_downloadlimit: 5.1.0
  • files_external: 1.25.1
  • files_pdfviewer: 6.0.0
  • files_reminders: 1.6.0
  • files_sharing: 1.25.2
  • files_trashbin: 1.23.0
  • files_versions: 1.26.0
  • firstrunwizard: 6.0.0
  • fulltextsearch: 33.0.0
  • groupfolders: 21.0.7
  • integration_dropbox: 5.0.0
  • logreader: 6.0.0
  • lookup_server_connector: 1.21.0
  • nextcloud_announcements: 5.0.0
  • notes: 5.0.0
  • notifications: 6.0.0
  • oauth2: 1.21.0
  • onlyoffice: 10.0.0
  • password_policy: 5.0.0
  • photos: 6.0.0
  • privacy: 5.0.0
  • profile: 1.2.0
  • provisioning_api: 1.23.0
  • recommendations: 6.0.0
  • related_resources: 4.0.0
  • serverinfo: 5.0.0
  • settings: 1.16.0
  • sharebymail: 1.23.0
  • support: 5.0.0
  • survey_client: 5.0.0
  • suspicious_login: 11.0.0
  • systemtags: 1.23.0
  • tables: 2.1.1
  • text: 7.0.1
  • theming: 2.8.0
  • twofactor_backupcodes: 1.22.0
  • twofactor_nextcloud_notification: 7.0.0
  • twofactor_totp: 15.0.0
  • updatenotification: 1.23.0
  • uppush: 2.4.0
  • user_status: 1.13.0
  • viewer: 6.0.0
  • weather_status: 1.13.0
  • webhook_listeners: 1.5.0
  • workflowengine: 2.15.0
    Disabled:
  • app_api: 33.0.0 (installed 32.0.0)
  • testing: 1.23.0
  • user_ldap: 1.24.0 (installed 1.22.0)