Error: file locked


i’m getting an error while synchronizing with my nextcloud. although sync seems to work properly.

Remote-Objekte aktualisiert: 1.

Abgeschlossen: 05/06/2020 15:57

Letzte Fehlermeldung: Error: PUT "joplin/" is locked (Exception OCA\DAV\Connector\Sabre\Exception\FileLocked) (423): <?xml version="1.0" encoding="utf-8"?> <d:error xmlns:d="DAV:" xmlns:s=""> <s:exception>OCA\DAV\Connector\Sabre\Exception\FileLocked</s:exception> <s:message>"joplin/" is locked</s:message> </d:error>

i’m running joplin 1.0.170 on linux debian, synching to nextcloud.
when i delete the indicated “locked file” another error message with another “locked file” appears. any idea how to solve this problem?