Sync error on modification from another client

[mazimmer]

When I sync a note from ownNotes to another client (desktop) and modify the note there, on trying to sync down, I get the following error: "local.client. object has no attribute 'rename'"
When I then rename or delete the note on ownNotes, the the server version gets synced down.
This also happens if no other client is involved, ie. editing the note directly on the server.

What I noticed (maybe related):
When syncing down a note from the webdav server (ownCloud 9.0), the resulting timestamp is 1 hour behind the actual modification time. When I then change that note on the client, a proper timestamp is set. On the server, however, the timestamps are correct, whether the file is created there or uploaded from ownNotes.