All devices have stopped syncing

Support
1

Operating system

Linux

Joplin version

3.3.12

Desktop version info

Joplin 3.3.12 (prod, linux)

Device: linux, Intel(R) Core(TM) i5-8350U CPU @ 1.70GHz
Client ID: 8db3c1e5bf484855a7cdd8d66e19429f
Sync Version: 3
Profile Version: 47
Keychain Supported: No
Alternative instance ID: -

Revision: 4d790b6

Backup: 1.4.3
Freehand Drawing: 3.0.1
Quick Move: 1.1.0
Remove Images: 0.0.2
Table Formatter Plugin: 1.2.1

Sync target

WebDAV

Editor

Markdown Editor

What issue do you have?

Linux desktop and Android clients fail to sync with the error:

Completed: 18/06/2025 18:50 (3s)
Last error: SyntaxError: Unexpected token '<', "<!doctype "... is not valid JSON

I am guessing this is a database corruption? Is there an easy way to recover?

2

The problem is not a database corruption, otherwise it would only break 1 client (device). Who is your WebDAV provider and are you on a free or paid plan?

There have been reported issues where WebDAV providers (eg. TabDigital) particularly on free plans have made changes which have caused the data on the server to become corrupted.

Also, if you could include a section of the log file which includes that error, it may give additional details