Comment 2 for bug 951375

StacktraceTop:
 gdk_window_get_screen (window=0xb707e699) at /build/buildd/gtk+3.0-3.3.18/./gdk/gdkwindow.c:2200
 gdk_device_get_position (device=0x8e9e910, screen=0xbfdbd2ac, x=0xbfdbd2a4, y=0xbfdbd2a8) at /build/buildd/gtk+3.0-3.3.18/./gdk/gdkdevice.c:451
 gtk_menu_position (menu=0x9329408, set_scroll_offset=1) at /build/buildd/gtk+3.0-3.3.18/./gtk/gtkmenu.c:4604
 gtk_menu_popup_for_device (menu=0x9329408, device=<optimized out>, parent_menu_shell=0x0, parent_menu_item=0x0, func=0, data=0x0, destroy=0, button=3, activate_time=104968) at /build/buildd/gtk+3.0-3.3.18/./gtk/gtkmenu.c:1661
 gtk_menu_popup (menu=0x9329408, parent_menu_shell=0x0, parent_menu_item=0x0, func=0, data=0x0, button=3, activate_time=104968) at /build/buildd/gtk+3.0-3.3.18/./gtk/gtkmenu.c:1758