Version-Release number of selected component:
gnome-software-40.3-2.fc34

Additional info:
reporter:       libreport-2.15.2
backtrace_rating: 4
cgroup:         0::/user.slice/user-1000.slice/user/app.slice/app-gnome-gnome\x2dsoftware\x2dservice-1818.scope
cmdline:        /usr/bin/gnome-software --gapplication-service
crash_function: g_type_check_instance_is_fundamentally_a
executable:     /usr/bin/gnome-software
journald_cursor: s=8f3041cde41b4016a151ae0597436419;i=267f7;b=f3226471a1034acea256c62081d822ce;m=1caf0fd2;t=5c753786e4f88;x=116e2f92b20a8e46
kernel:         5.12.15-300.fc34.x86_64
rootdir:        /
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 g_type_check_instance_is_fundamentally_a at ../gobject/gtype.c:4082
 #2 pk_client_state_finish at ../lib/packagekit-glib2/pk-client.c:667
 #3 pk_client_cancel_cb at ../lib/packagekit-glib2/pk-client.c:583
 #4 g_task_return_now at ../gio/gtask.c:1219
 #5 g_task_return at ../gio/gtask.c:1289
 #7 reply_cb at ../gio/gdbusproxy.c:2547
 #8 g_task_return_now at ../gio/gtask.c:1219
 #9 g_task_return at ../gio/gtask.c:1289
 #11 g_dbus_connection_call_done at ../gio/gdbusconnection.c:5787
 #12 g_task_return_now at ../gio/gtask.c:1219