Flatpak installed app displays a blank window and crashes after a while

Observed behaviour

I tried the AppImage and it works, but the flatpak version doesn't. Im using Fedora Kinoite When i run the flatpak version, it just stays blank and crashes after a while.

Reproduction steps

Installed flatpak
Ran Fluxer (in terminal or via desktop)
Window is blank and it crashes after a while

Build information

Version 0.0.8 (checked with Discover as i can't use the app)

Platform

macOS, Windows, Linux

Evidence

In this image, the blank window is Fluxer: image When ran through the terminal:

➜  flatpak run app.fluxer.Fluxer
[2 preload-host-spawn-strategy] Failed to expose '' into sandbox: No such file or directory (errno 2)
[2:0920/232641.955832:ERROR:dbus/bus.cc:406] Failed to connect to the bus: Failed to connect to socket /run/dbus/system_bus_socket: No such file or directory
23:26:42.093 › Configured user data storage {
  channel: 'stable',
  directory: 'fluxer',
  path: '/home/jc-bazziteDsk/.var/app/app.fluxer.Fluxer/config/fluxer'
}
[2:0920/232642.327847:ERROR:dbus/bus.cc:406] Failed to connect to the bus: Failed to connect to socket /run/dbus/system_bus_socket: No such file or directory
[2:0920/232642.327887:ERROR:dbus/bus.cc:406] Failed to connect to the bus: Failed to connect to socket /run/dbus/system_bus_socket: No such file or directory
23:26:42.335 › App ready, initializing...
LaunchProcess: failed to execvp:
xdg-settings
23:26:42.364 › Electron's autoUpdater does not support the 'linux' platform. Ref: https://www.electronjs.org/docs/latest/api/auto-updater#platform-notices
23:26:42.366 › App initialized successfully
23:26:42.370 › [RPC] Server listening on http://127.0.0.1:21863
Error occurred in handler for 'autostart-is-initialized': Error: No handler registered for 'autostart-is-initialized'
    at Session.<anonymous> (node:electron/js2c/browser_init:2:110745)
    at Session.emit (node:events:508:28)
hook_thread_proc [101]: Could not set thread priority 49 for thread 0x7FF0707EE6C0!
xrecord_start [1024]: XOpenDisplay failure!

✗  flatpak info app.fluxer.Fluxer

Fluxer - Instant messaging and VoIP

            ID: app.fluxer.Fluxer
           Ref: app/app.fluxer.Fluxer/x86_64/stable
          Arch: x86_64
        Branch: stable
       Version: 0.0.8
       License: AGPL-3.0-or-later
        Origin: flathub
    Collection: org.flathub.Stable
  Installation: user
Installed Size: 320.9 MB
       Runtime: org.freedesktop.Platform/x86_64/25.08
           Sdk: org.freedesktop.Sdk/x86_64/25.08

        Commit: f8e09686ab2bbe475bc1415939ea2630bd6ff5c7b6d532f2cd20e6d6c708cc28
        Parent: c8b4e10bce8e348f821a7ebaa7bc45aba264c356c653327b325f8e3e0d102a94
       Subject: Merge pull request #12 from yofukashino/zypak-x11 (a1a216cdafce)
          Date: 2026-05-04 17:05:27 +0000

4 comments

RexSystem 1 vote 15d ago originally by @SolunaCG on GitHub

It looks like you're using the old Flatpak from Flathub (0.0.8). Fluxer now provides its own official Flatpak, which you can install from the download page: https://fluxer.app/download#desktop The Flatpak install command listed there is: flatpak install https://pkgs.fluxer.com/flatpak/fluxer.flatpakref Might be worth trying the current official Flatpak first and checking if the issue still occurs there.

RexSystem 1 vote 14d ago originally by @X30N1 on GitHub

Flathub build is mostly prepared https://github.com/flathub/app.fluxer.Fluxer/pull/14 but blocked due to flathub requirements https://github.com/fluxerapp/fluxer/pull/2872 will likely fix the issue once merged

RexSystem 1 vote 14d ago edited originally by @X30N1 on GitHub

@jorart10 Please try updating on flathub and checking if the error occurs still

RexSystem 1 vote 14d ago edited originally by @jorart10 on GitHub OP

@SolunaCG i went to the website and clicked download flatpak, it then redirects me to open discover. That is how i downloaded it. I don't if that is what is supposed to happen. I tried updating and it says up to date, but now it magically works. ty