NC 20.04 upload problem from external link: Call to a member function getUID() on null

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Steps to reproduce

1. Create new share from link with external guest, with write permission
2. External Guest upload a file
3. External Guest receive error and don't show the uploaded file
4. If external guest refresh the page, the file appears

Server configuration

Operating system: # uname -a
Linux n1 4.9.0-12-amd64 1 SMP Debian 4.9.210-1 (2020-01-20) x86_64 GNU/Linux

Web server: # apache2 -v
Server version: Apache/2.4.25 (Debian)

Database: # mysql --version
mysql Ver 15.1 Distrib 10.1.47-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2

PHP version: Versione: 7.3.25

Nextcloud version: 20.04

Updated from an older Nextcloud/ownCloud or fresh install: update every time from 18

List of activated apps:
Enabled:

• accessibility: 1.5.0
• activity: 2.12.1
• apporder: 0.11.0
• bruteforcesettings: 2.0.1
• calendar: 2.0.4
• camerarawpreviews: 0.7.10
• checksum: 0.4.5
• cloud_federation_api: 1.2.0
• comments: 1.9.0
• contacts: 3.4.2
• contactsinteraction: 1.0.0
• dav: 1.15.0
• drawio: 0.9.8
• external: 3.6.0
• federatedfilesharing: 1.9.0
• federation: 1.9.0
• files: 1.14.0
• files_antivirus: 3.1.0
• files_fulltextsearch: 1.4.3
• files_fulltextsearch_tesseract: 1.4.2
• files_linkeditor: 1.1.3
• files_mindmap: 0.0.23
• files_pdfviewer: 1.8.0
• files_rightclick: 0.16.0
• files_sharing: 1.11.0
• files_trackdownloads: 1.8.0
• files_trashbin: 1.9.0
• files_versions: 1.12.0
• files_videoplayer: 1.8.0
• fulltextsearch: 1.4.2
• fulltextsearch_elasticsearch: 1.5.2
• gpxedit: 0.0.13
• gpxmotion: 0.0.11
• gpxpod: 4.2.2
• impersonate: 1.6.1
• logreader: 2.4.0
• lookup_server_connector: 1.7.0
• nextcloud_announcements: 1.8.0
• notifications: 2.7.0
• oauth2: 1.7.0
• occweb: 0.0.7
• onlyoffice: 6.2.0
• password_policy: 1.9.1
• passwords: 2020.12.0
• phonetrack: 0.6.4
• photos: 1.1.0
• privacy: 1.3.0
• provisioning_api: 1.9.0
• rainloop: 7.0.3
• ransomware_protection: 1.7.0
• recommendations: 0.7.0
• serverinfo: 1.9.0
• settings: 1.1.0
• sharebymail: 1.9.0
• spreed: 9.0.6
• support: 1.2.1
• survey_client: 1.7.0
• systemtags: 1.9.0
• tasks: 0.13.6
• terms_of_service: 1.5.2
• text: 3.0.1
• theming: 1.10.0
• twofactor_backupcodes: 1.8.0
• twofactor_nextcloud_notification: 2.3.0
• twofactor_totp: 5.0.0
• twofactor_u2f: 6.0.0
• updatenotification: 1.9.0
• user_usage_report: 1.3.3
• viewer: 1.3.0
• workflowengine: 2.1.0

Client configuration

Browser: any browser

Logs

Fatal | webdav | Error: Call to a member function getUID() on null/var/www/html/n1/lib/private/EventDispatcher/ServiceEventListener.php - line 76:OCA\Files_FullTextSearch\Listeners\FileCreated->handle(OCP\Files\Ev ... {})/var/www/html/n1/3rdparty/symfony/event-dispatcher/EventDispatcher.php - line 251:OC\EventDispatcher\ServiceEventListener->__invoke(OCP\Files\Ev ... {}, "OCP\Files\ ... t", Symfony\Comp ... {})/var/www/html/n1/3rdparty/symfony/event-dispatcher/EventDispatcher.php - line 73:Symfony\Component\EventDispatcher\EventDispatcher->callListeners([ Closure {}], "OCP\Files\ ... t", OCP\Files\Ev ... {})/var/www/html/n1/lib/private/EventDispatcher/EventDispatcher.php - line 86:Symfony\Component\EventDispatcher\EventDispatcher->dispatch(OCP\Files\Ev ... {}, "OCP\Files\ ... t")/var/www/html/n1/lib/private/EventDispatcher/EventDispatcher.php - line 98:OC\EventDispatcher\EventDispatcher->dispatch("OCP\Files\ ... t", OCP\Files\Ev ... {})/var/www/html/n1/lib/private/Files/Node/HookConnector.php - line 137:OC\EventDispatcher\EventDispatcher->dispatchTyped(OCP\Files\Ev ... {})/var/www/html/n1/lib/private/legacy/OC_Hook.php - line 110:OC\Files\Node\HookConnector->postCreate({ path: "/Sh ... "})/var/www/html/n1/apps/dav/lib/Connector/Sabre/File.php - line 407:OC_Hook::emit("OC_Filesystem", "post_create", { path: "/Sh ... "})/var/www/html/n1/apps/dav/lib/Connector/Sabre/File.php - line 340:OCA\DAV\Connector\Sabre\File->emitPostHooks(false)/var/www/html/n1/apps/dav/lib/Connector/Sabre/Directory.php - line 155:OCA\DAV\Connector\Sabre\File->put(null)/var/www/html/n1/3rdparty/sabre/dav/lib/DAV/Server.php - line 1104:OCA\DAV\Connector\Sabre\Directory->createFile("sito4.png", null)/var/www/html/n1/3rdparty/sabre/dav/lib/DAV/CorePlugin.php - line 527:Sabre\DAV\Server->createFile("sito4.png", null, null)/var/www/html/n1/3rdparty/sabre/event/lib/WildcardEmitterTrait.php - line 89:Sabre\DAV\CorePlugin->httpPut(Sabre\HTTP\Request {}, Sabre\HTTP\Response {})/var/www/html/n1/3rdparty/sabre/dav/lib/DAV/Server.php - line 474:Sabre\DAV\Server->emit("method:PUT", [ Sabre\HTTP ... }])/var/www/html/n1/3rdparty/sabre/dav/lib/DAV/Server.php - line 251:Sabre\DAV\Server->invokeMethod(Sabre\HTTP\Request {}, Sabre\HTTP\Response {})/var/www/html/n1/3rdparty/sabre/dav/lib/DAV/Server.php - line 319:Sabre\DAV\Server->start()/var/www/html/n1/apps/dav/appinfo/v1/publicwebdav.php - line 113:Sabre\DAV\Server->exec()/var/www/html/n1/public.php - line 81:require_once("/var/www/ht ... p")

Info:

• occ files:scan --all /var/www/html/n1/ -> don't solve the problem
• i know the issue https://github.com/nextcloud/server/issues/19996 nextcloud/server#19996 but it is close and i think this is another problem, not the same. I have search but i don't have see this problem with solution.

Start with apps/files_fulltextsearch/Listeners/FileCreated.php and the ServiceEventListener.php stack-trace location, then trace the DAV upload path through apps/dav/lib/Connector/Sabre/File.php. Reproduce an external guest upload to a write-enabled link and verify that it completes without the getUID() fatal and the file appears immediately.