Nextcloud desktop now crashes when vfs is enabled

Yesterday I noticed files from my manjaro linux desktop are no longer synchronising to nextcloud. It appears the nextcloud desktop client crashes on start-up. I am not sure when this started happening (as normally nextcloud is working in the background no need to babysit it).

I removed my nextcloud.cfg file and then it does start up but the moment I (re-)enable virtual file support, the client crashes. It’s the first time I have issues with this feature.

 nextcloud --version                                                                                                                                                                                                                                   1 ✘ 
Qt: Session management error: Authentication Rejected, reason : MIT-MAGIC-COOKIE-1 authentication rejected
QGuiApplication::setDesktopFileName: the specified desktop file name ends with .desktop. For compatibility reasons, the .desktop suffix will be removed. Please specify a desktop file name without .desktop suffix
nextcloud.gui.application: Migrating old config from "/home/dries/.local/share/Nextcloud" to "/home/dries/.config/Nextcloud"
nextcloud.gui.application: Failed to move the old config directory to its new location ( "/home/dries/.local/share/Nextcloud" to "/home/dries/.config/Nextcloud" )
nextcloud.gui.application: Will move the individual files QList("Nextcloud_sync.log")
nextcloud.gui.application: Fallback move of  "Nextcloud_sync.log" also failed
Nextcloud version 3.14.0daily
Git revision d8fcb9273729c0e70f99d6f42ed7185c2bb69779
Using Qt 6.7.2, built against Qt 6.7.2
Using Qt platform plugin 'xcb'
Using 'OpenSSL 3.3.2 3 Sep 2024'
Running on Manjaro Linux, x86_64

When I copy a backup.enextcloud.cfg to nextcloud.cfg:

 nextcloud                                                                                                                                                                                                                                               ✔ 
Qt: Session management error: Authentication Rejected, reason : MIT-MAGIC-COOKIE-1 authentication rejected
QGuiApplication::setDesktopFileName: the specified desktop file name ends with .desktop. For compatibility reasons, the .desktop suffix will be removed. Please specify a desktop file name without .desktop suffix
nextcloud.gui.application: Migrating old config from "/home/dries/.local/share/Nextcloud" to "/home/dries/.config/Nextcloud"
nextcloud.gui.application: Failed to move the old config directory to its new location ( "/home/dries/.local/share/Nextcloud" to "/home/dries/.config/Nextcloud" )
nextcloud.gui.application: Will move the individual files QList("Nextcloud_sync.log")
nextcloud.gui.application: Fallback move of  "Nextcloud_sync.log" also failed
zsh: IOT instruction (core dumped)  nextcloud

Any ideas what to do?

I found an older issue regarding the IOT instruction:

and for the migration of profiles, there are several:

Not sure what the main/initial issue is, if that is related to some old config. I’d perhaps try on a different/new user, if a new instance also crashes and then submit a bug report with logs from this crash to the bug tracker: GitHub · Where software is built

And when that works with a new account, and you still have the problem with the config file, you can ask specifically for help with that.