Your system information

• Steam client version: Jun 8 2021
• Distribution: Fedora 34, GNOME, wayland
• Opted into Steam client beta?: No
• Have you checked for system updates?: Yes

Description

The Steam client crashes/closes once GNOME shows the Shutdown dialog (this is at a point where the user has not decided yet). This is independent of whether Steam currently is focused and/or is minimized. If the user chooses not to shutdown the Steam client will be gone by that time.

Steam is the only application known to do this based on the feedback from #gnome.

The Steam client shows the following lines once GNOME presents the Shutdown dialog:

Exiting workitem thread
(steam:17870): GLib-GObject-CRITICAL **: 22:32:45.624: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
(steam:17870): GLib-GObject-WARNING **: 22:32:45.624: invalid (NULL) pointer instance
(steam:17870): GLib-GObject-CRITICAL **: 22:32:45.624: g_signal_handlers_disconnect_matched: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
(steam:17870): GLib-GObject-CRITICAL **: 22:32:45.624: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
[2021-07-07 22:32:45] Shutdown

Gnome shutdown dialog window:

Steps for reproducing this issue:

1. Have Steam open
2. Open the Shutdown dialog of GNOME either by
   2.1 CTRL + ALT + DEL or
   2.2 Top right corner click -> Poweroff
3. Press Cancel when asked to confirm the Shutdown
4. Steam will have closed itself