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Cannot read property 'filter' of undefined

See original GitHub issue

Describe the bug I stupidly updated NC Bookmarks to 3.1.0 without checking how long it’s been out (~2 hours), and floccus immediately came up with this error in Brave (Chromium): Cannot read property 'filter' of undefined. Firefox (which uses another server folder) comes back with: this.children is undefined. I’ve tried removing the account, removing the local bookmarks and setting sync up again, but still having the same issue.

To Reproduce Steps to reproduce the behavior:

Upgrade to NC Bookmarks 3.1.0
Either force sync or wait for floccus to sync, and it will come back with an error.

Expected behavior floccus syncs local changes to NC Bookmarks.

Screenshots If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

OS: Windows Enterprise 1909
Browser: Brave (Chromium)
Browser Version:Version 1.9.76 Chromium: 81.0.4044.138 (Official Build) (64-bit)
Floccus version: 4.1.0
Floccus sync method: NextCloud Folders

Server (please complete the following information):

OS: Ubuntu 18.04.4 LTS
Nextcloud version: 18.0.4
Bookmarks app version: 3.1.0

Note: Please write down the actual version numbers instead of writing ‘latest’.

Debug log It is often useful to provide a debug log file along with the issue. You can obtain a debug log of the most recent sync runs by clicking ‘Debug log’ in the bottom right corner of the floccus panel in your browser.

Note: As your debug log usually contains large parts of your bookmark data, instead of attaching it publicly to the issue here, I recommend uploading it privately at the following URL https://klehranlage.net/index.php/s/7nn82NSBsfQKdsJ

Debug log provided File Name: GitHub_Issue-547_floccus-4.1.0-2020-06-03

Additional context I also use nextBookmark on iOS, and it is syncing correctly, just as a point of reference that NextCloud sync is still working.

Cheers, Josh