The given affected user is invalid FilesHooks.php

Hello!
Nextcloud version 12.0.3:
Operating system and version Debian 9:
Nginx version: 1.12.1:
PHP version 7.0.19:

There is always an error in the logs

Summary
InvalidArgumentException: The given affected user is invalid

/var/www/nextcloud/apps/activity/lib/FilesHooks.php - line 1066: OC\Activity\Event->setAffectedUser(0)
/var/www/nextcloud/apps/activity/lib/FilesHooks.php - line 408: OCA\Activity\FilesHooks->addNotificationsForUser(0, 'renamed_by', Array, 337758, '/25107/\xD0\xA4\xD0\x9E\xD0\xA2\xD0\x9E...', true, true, 0, 'file_changed')
/var/www/nextcloud/apps/activity/lib/FilesHooks.php - line 337: OCA\Activity\FilesHooks->fileRenaming('/25107/\xD0\xA4\xD0\x9E\xD0\xA2\xD0\x9E...', '/25107/\xD0\xA4\xD0\x9E\xD0\xA2\xD0\x9E...')
/var/www/nextcloud/apps/activity/lib/FilesHooksStatic.php - line 79: OCA\Activity\FilesHooks->fileMovePost('/25107/\xD0\xA4\xD0\x9E\xD0\xA2\xD0\x9E...', '/25107/\xD0\xA4\xD0\x9E\xD0\xA2\xD0\x9E...')
/var/www/nextcloud/lib/private/legacy/hook.php - line 106: OCA\Activity\FilesHooksStatic fileMovePost(Array)
/var/www/nextcloud/lib/private/Files/View.php - line 833: OC_Hook emit('OC_Filesystem', 'post_rename', Array)
/var/www/nextcloud/apps/dav/lib/Connector/Sabre/Node.php - line 137: OC\Files\View->rename('/25107/\xD0\xA4\xD0\x9E\xD0\xA2\xD0\x9E...', '/25107/\xD0\xA4\xD0\x9E\xD0\xA2\xD0\x9E...')
/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Tree.php - line 151: OCA\DAV\Connector\Sabre\Node->setName('03.10.17')
/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/CorePlugin.php - line 642: Sabre\DAV\Tree->move('25107/\xD0\xA4\xD0\x9E\xD0\xA2\xD0\x9E\xD0...', '25107/\xD0\xA4\xD0\x9E\xD0\xA2\xD0\x9E\xD0...')
[internal function] Sabre\DAV\CorePlugin->httpMove(Object(Sabre\HTTP\Request), Object(Sabre\HTTP\Response))
/var/www/nextcloud/3rdparty/sabre/event/lib/EventEmitterTrait.php - line 105: call_user_func_array(Array, Array)
/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 479: Sabre\Event\EventEmitter->emit('method MOVE', Array)
/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 254: Sabre\DAV\Server->invokeMethod(Object(Sabre\HTTP\Request), Object(Sabre\HTTP\Response))
/var/www/nextcloud/apps/dav/appinfo/v1/webdav.php - line 76: Sabre\DAV\Server->exec()
/var/www/nextcloud/remote.php - line 162: require_once('/var/www/nextcl...')
{main}
Summary

InvalidArgumentException: The given affected user is invalid

/var/www/nextcloud/apps/activity/lib/FilesHooks.php - line 1066: OC\Activity\Event->setAffectedUser(12121)
/var/www/nextcloud/apps/activity/lib/FilesHooks.php - line 902: OCA\Activity\FilesHooks->addNotificationsForUser(12121, 'shared_with_by', Array, 224823, '/\xD0\x94\xD0\xBE\xD0\xBA\xD1\x83\xD0\xBC\xD0\xB5\xD0\xBD...', false, true, 0)
/var/www/nextcloud/apps/activity/lib/FilesHooks.php - line 730: OCA\Activity\FilesHooks->addNotificationsForGroupUsers(Array, 'shared_with_by', 224823, 'folder', '/\xD0\x94\xD0\xBE\xD0\xBA\xD1\x83\xD0\xBC\xD0\xB5\xD0\xBD...', 4082)
/var/www/nextcloud/apps/activity/lib/FilesHooks.php - line 674: OCA\Activity\FilesHooks->shareWithGroup('owncloud_121', 224823, 'folder', '/\xD0\x94\xD0\xBE\xD0\xBA\xD1\x83\xD0\xBC\xD0\xB5\xD0\xBD...', 4082)
/var/www/nextcloud/apps/activity/lib/FilesHooksStatic.php - line 95: OCA\Activity\FilesHooks->share(Array)
/var/www/nextcloud/lib/private/legacy/hook.php - line 106: OCA\Activity\FilesHooksStatic share(Array)
/var/www/nextcloud/lib/private/Share20/Manager.php - line 691: OC_Hook emit('OCP\\Share', 'post_shared', Array)
/var/www/nextcloud/apps/files_sharing/lib/Controller/ShareAPIController.php - line 473: OC\Share20\Manager->createShare(Object(OC\Share20\Share))
[internal function] OCA\Files_Sharing\Controller\ShareAPIController->createShare(Object(OC\Files\Node\Folder), 31, 1, 'owncloud_121', 'false', '', '')
/var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php - line 160: call_user_func_array(Array, Array)
/var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php - line 90: OC\AppFramework\Http\Dispatcher->executeController(Object(OCA\Files_Sharing\Controller\ShareAPIController), 'createShare')
/var/www/nextcloud/lib/private/AppFramework/App.php - line 114: OC\AppFramework\Http\Dispatcher->dispatch(Object(OCA\Files_Sharing\Controller\ShareAPIController), 'createShare')
/var/www/nextcloud/lib/private/AppFramework/Routing/RouteActionHandler.php - line 47: OC\AppFramework\App main('OCA\\Files_Shari...', 'createShare', Object(OC\AppFramework\DependencyInjection\DIContainer), Array)
[internal function] OC\AppFramework\Routing\RouteActionHandler->__invoke(Array)
/var/www/nextcloud/lib/private/Route/Router.php - line 299: call_user_func(Object(OC\AppFramework\Routing\RouteActionHandler), Array)
/var/www/nextcloud/ocs/v1.php - line 77: OC\Route\Router->match('/ocsapp/apps/fi...')
/var/www/nextcloud/ocs/v2.php - line 23: require_once('/var/www/nextcl...')
{main}

Has anyone seen this?
Thank you in advance.