OS : archlinux 64bit

nautilus-3.8.1
mutter-3.8.1
gnome-shell-3.8.1
gtk3-3.8.1-1

other info (maybe useful)
- default ADWAITA themes (gtk,mutter and gnome shell)
- no third-part extension loaded..
- gnome-session start manually from runlevel 3 (no GDM)


If you close a Files instance and relaunch it quickly from favorites (dash) often gnome-shell crash and restart. Suddenly, close again Files instance and, launch againg ,quickly,  Files from favorites, gnome shell crash at exit from X session  

these are captured errors when issue happens:


First crash :  gnome shell is restarted
----------------------------------------

(gnome-shell:3490): St-ERROR **: st_widget_get_theme_node called on the widget [0x4409840 StWidget.window-picker:last-child first-child] which is not in the stage.
gnome-session[3409]: WARNING: Application 'gnome-shell.desktop' killed by signal 5
** Message: applet now removed from the notification area

Second crash after a while : OOPS error appears ... something has gone wrong
-----------------------------------------------------------------------------

(gnome-shell:3664): St-ERROR **: st_widget_get_theme_node called on the widget [0x469ab60 StWidget.window-picker:last-child first-child] which is not in the stage.
gnome-session[3409]: WARNING: Application 'gnome-shell.desktop' killed by signal 5
gnome-session[3409]: WARNING: App 'gnome-shell.desktop' respawning too quickly
** Message: applet now removed from the notification area



Regards
Andrea