Warnings about "-1" user when launching Users panel
10:29:22.9307 user-accounts-cc-panel[376547]: WARNING: Error retrieving app filter for user (null): User 4294967295 does not exist
10:29:22.9672 GLib-GObject[376547]: WARNING: invalid uninstantiatable type '(null)' in cast to 'GObject'
10:29:22.9673 GLib-GObject[376547]:CRITICAL: g_object_set_data: assertion 'G_IS_OBJECT (object)' failed
#0 0x00007ffff7c7deb1 in g_logv () at /lib64/libglib-2.0.so.0
#1 0x00007ffff7c7e133 in g_log () at /lib64/libglib-2.0.so.0
#2 0x00000000004fd2a5 in is_parental_controls_enabled_for_user (user=0x202c740) at ../../../../Projects/jhbuild/gnome-control-center/panels/user-accounts/cc-user-panel.c:793
#3 show_user (user=<optimized out>, self=0x7ed260) at ../../../../Projects/jhbuild/gnome-control-center/panels/user-accounts/cc-user-panel.c:918
#4 0x00000000004fd517 in show_current_user (self=0x7ed260) at ../../../../Projects/jhbuild/gnome-control-center/panels/user-accounts/cc-user-panel.c:187
#5 users_loaded (self=0x7ed260) at ../../../../Projects/jhbuild/gnome-control-center/panels/user-accounts/cc-user-panel.c:1229
#6 0x00007ffff7d72fc0 in g_closure_invoke () at /lib64/libgobject-2.0.so.0
#7 0x00007ffff7da0d86 in signal_emit_unlocked_R.isra.0 () at /lib64/libgobject-2.0.so.0
#8 0x00007ffff7d9041a in g_signal_emit_valist () at /lib64/libgobject-2.0.so.0
#9 0x00007ffff7d90633 in g_signal_emit () at /lib64/libgobject-2.0.so.0
#10 0x00007ffff7d7cf94 in g_object_dispatch_properties_changed.lto_priv () at /lib64/libgobject-2.0.so.0
#11 0x00007ffff7d82b2f in g_object_notify () at /lib64/libgobject-2.0.so.0
#12 0x00007ffff68d81c5 in set_is_loaded (manager=manager@entry=0xad3080, is_loaded=is_loaded@entry=1) at ../../../../Projects/jhbuild/accountsservice/src/libaccountsservice/act-user-manager.c:1262
#13 0x00007ffff68d8254 in maybe_set_is_loaded (manager=manager@entry=0xad3080) at ../../../../Projects/jhbuild/accountsservice/src/libaccountsservice/act-user-manager.c:2046
#14 0x00007ffff68dd857 in load_seat_incrementally (manager=0xad3080) at ../../../../Projects/jhbuild/accountsservice/src/libaccountsservice/act-user-manager.c:2134
#15 0x00007ffff7c74cb2 in g_idle_dispatch () at /lib64/libglib-2.0.so.0
#16 0x00007ffff7c75cbf in g_main_context_dispatch () at /lib64/libglib-2.0.so.0
#17 0x00007ffff7ccb598 in g_main_context_iterate.constprop () at /lib64/libglib-2.0.so.0
#18 0x00007ffff7c72f40 in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#19 0x00007ffff7ea194d in g_application_run () at /lib64/libgio-2.0.so.0
#20 0x0000000000452e4a in main (argc=1, argv=0x7fffffffd048) at ../../../../Projects/jhbuild/gnome-control-center/shell/main.c:62
See also #1816 (comment 1447122)