GNOME session crashes when opening a new blank document

[srueegger]

Describe the Bug

Opening a new blank document in Collabora Office causes the entire GNOME session to crash. The user is immediately logged out and returned to the GDM login screen. Collabora Office itself does not display any error dialog before the crash occurs.

Steps to Reproduce

1. Launch Collabora Office (Desktop, Flatpak version 25.04.9.2-2)
2. The Start Center opens normally
3. Click on “Empty Document” to create a new blank document
4. The entire GNOME session crashes instantly
5. The user is returned to the GDM login screen and has to log in again

Expected Behavior

A new blank document should open in Collabora Office Writer without affecting the desktop session.

Actual Behavior

Clicking “Empty Document” causes the entire GNOME desktop session to crash. The display server (Wayland/Mutter) appears to be terminated, resulting in a complete logout to GDM. No error message is shown before the crash.

Screenshots

N/A (the session crashes before anything can be captured)

Desktop

(Please complete the following information)

• Collabora Office version: 25.04.9.2-2 (Flatpak)
• OS and version: Bluefin Linux, GNOME 49.5
• GPU: Intel only

Additional Context

• The crash is reproducible on every attempt.
• I ran Collabora Office with the --debug flag and redirected the output to a log file using flatpak run com.collaboraoffice.Office --debug 2>&1 | tee ~/collabora_debug.log before the crash. The debug log is attached below.
• The crash affects the entire GNOME session, not just the application. This suggests that Collabora Office may be interfering with the GPU context or the Wayland compositor (Mutter), causing it to terminate.

collabora_debug.log

[Ezinnem]

cc @Quwex