FATAL error during recovery of deleted items

During the recovery of some deleted items I got the following FATAL error within the log

Nextcloud version (eg, 20.0.5): 21.0.1.1
Operating system and version (eg, Ubuntu 20.04): DEBIAN 10 (buster)
Apache or nginx version (eg, Apache 2.4.25): Apache/2.4.38 (Debian)
PHP version (eg, 7.4): 7.3

{“reqId”:“Bpzhh8AL1PKFRfvQnkaP”,“level”:4,“time”:“2021-04-14T13:41:31+02:00”,“remoteAddr”:“xxx.xxx.xxx.xxx”,“user”:“userid”,“app”:“webdav”,“method”:“MOVE”,“url”:"/remote.php/dav/trashbin/userid/trash/IMG_20190524_222658.jpg.d1589558693",“message”:{“Exception”:“OCP\Lock\LockedException”,“Message”:"“files/ca26df219492790e4233a0cfe03e11f1”(“home::userid::scanner::files_trashbin/versions”) is locked",“Code”:0,“Trace”:[{“file”:"/var/www/nextcloud/lib/private/Files/Storage/Common.php",“line”:752,“function”:“acquireLock”,“class”:“OC\Lock\DBLockingProvider”,“type”:"->",“args”:[“files/ca26df219492790e4233a0cfe03e11f1”,2,“home::userid::scanner::files_trashbin/versions”]},{“file”:"/var/www/nextcloud/lib/private/Files/Storage/Wrapper/Wrapper.php",“line”:592,“function”:“acquireLock”,“class”:“OC\Files\Storage\Common”,“type”:"->",“args”:[“scanner::files_trashbin/versions”,2,{“class”:“OC\Lock\DBLockingProvider”}]},{“file”:"/var/www/nextcloud/lib/private/Files/Cache/Scanner.php",“line”:334,“function”:“acquireLock”,“class”:“OC\Files\Storage\Wrapper\Wrapper”,“type”:"->",“args”:[“scanner::files_trashbin/versions”,2,{“class”:“OC\Lock\DBLockingProvider”}]},{“file”:"/var/www/nextcloud/apps/files_trashbin/lib/Trashbin.php",“line”:973,“function”:“scan”,“class”:“OC\Files\Cache\Scanner”,“type”:"->",“args”:[“files_trashbin/versions”]},{“file”:"/var/www/nextcloud/apps/files_trashbin/lib/Trashbin.php",“line”:561,“function”:“getVersionsFromTrash”,“class”:“OCA\Files_Trashbin\Trashbin”,“type”:"::",“args”:[“IMG_20190524_222658.jpg”,1589558693,“userid”]},{“file”:"/var/www/nextcloud/apps/files_trashbin/lib/Trashbin.php",“line”:511,“function”:“restoreVersions”,“class”:“OCA\Files_Trashbin\Trashbin”,“type”:"::",“args”:[{“class”:“OC\Files\View”},"/IMG_20190524_222658.jpg.d1589558693",“IMG_20190524_222658.jpg”,“IMG_20190524_222658.jpg”,“Handy/Fotos”,1589558693]},{“file”:"/var/www/nextcloud/apps/files_trashbin/lib/Trash/LegacyTrashBackend.php",“line”:85,“function”:“restore”,“class”:“OCA\Files_Trashbin\Trashbin”,“type”:"::",“args”:["/IMG_20190524_222658.jpg.d1589558693",“IMG_20190524_222658.jpg”,1589558693]},{“file”:"/var/www/nextcloud/apps/files_trashbin/lib/Trash/TrashManager.php",“line”:65,“function”:“restoreItem”,“class”:“OCA\Files_Trashbin\Trash\LegacyTrashBackend”,“type”:"->",“args”:[{“class”:“OCA\Files_Trashbin\Trash\TrashItem”}]},{“file”:"/var/www/nextcloud/apps/files_trashbin/lib/Sabre/AbstractTrash.php",“line”:94,“function”:“restoreItem”,“class”:“OCA\Files_Trashbin\Trash\TrashManager”,“type”:"->",“args”:[{“class”:“OCA\Files_Trashbin\Trash\TrashItem”}]},{“file”:"/var/www/nextcloud/apps/files_trashbin/lib/Sabre/RestoreFolder.php",“line”:76,“function”:“restore”,“class”:“OCA\Files_Trashbin\Sabre\AbstractTrash”,“type”:"->",“args”:[]},{“file”:"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Tree.php",“line”:160,“function”:“moveInto”,“class”:“OCA\Files_Trashbin\Sabre\RestoreFolder”,“type”:"->",“args”:[“IMG_20190524_222658.jpg.d1589558693”,“trashbin/userid/trash/IMG_20190524_222658.jpg.d1589558693”,{“class”:“OCA\Files_Trashbin\Sabre\TrashFile”}]},{“file”:"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/CorePlugin.php",“line”:612,“function”:“move”,“class”:“Sabre\DAV\Tree”,“type”:"->",“args”:[“trashbin/userid/trash/IMG_20190524_222658.jpg.d1589558693”,“trashbin/userid/restore/IMG_20190524_222658.jpg.d1589558693”]},{“file”:"/var/www/nextcloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php",“line”:89,“function”:“httpMove”,“class”:“Sabre\DAV\CorePlugin”,“type”:"->",“args”:[{“class”:“Sabre\HTTP\Request”},{“class”:“Sabre\HTTP\Response”}]},{“file”:"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php",“line”:472,“function”:“emit”,“class”:“Sabre\DAV\Server”,“type”:"->",“args”:[“method:MOVE”,[{“class”:“Sabre\HTTP\Request”},{“class”:“Sabre\HTTP\Response”}]]},{“file”:"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php",“line”:253,“function”:“invokeMethod”,“class”:“Sabre\DAV\Server”,“type”:"->",“args”:[{“class”:“Sabre\HTTP\Request”},{“class”:“Sabre\HTTP\Response”}]},{“file”:"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php",“line”:321,“function”:“start”,“class”:“Sabre\DAV\Server”,“type”:"->",“args”:[]},{“file”:"/var/www/nextcloud/apps/dav/lib/Server.php",“line”:332,“function”:“exec”,“class”:“Sabre\DAV\Server”,“type”:"->",“args”:[]},{“file”:"/var/www/nextcloud/apps/dav/appinfo/v2/remote.php",“line”:35,“function”:“exec”,“class”:“OCA\DAV\Server”,“type”:"->",“args”:[]},{“file”:"/var/www/nextcloud/remote.php",“line”:167,“args”:["/var/www/nextcloud/apps/dav/appinfo/v2/remote.php"],“function”:“require_once”}],“File”:"/var/www/nextcloud/lib/private/Lock/DBLockingProvider.php",“Line”:210,“CustomMessage”:"–"},“userAgent”:“Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:87.0) Gecko/20100101 Firefox/87.0”,“version”:“21.0.1.1”,“id”:“607704be925d0”}

Does somebody know, what’s the reason of this FATAL error and what happens if this error occurs. Is there something lost during the recovery?

Thank you in advance!