#0  0x009b1a27 in gtk_window_group_list_windows (window_group=0x8c50008) at /build/buildd/gtk+3.0-3.1.8/./gtk/gtkwindow.c:8454
        toplevels = <value optimized out>
        toplevel = <value optimized out>
        group_windows = <value optimized out>
        __PRETTY_FUNCTION__ = "gtk_window_group_list_windows"
#1  0x00993723 in gtk_widget_get_root_window (widget=0x8cb3960) at /build/buildd/gtk+3.0-3.1.8/./gtk/gtkwidget.c:9490
        __PRETTY_FUNCTION__ = "gtk_widget_get_root_window"
#2  0x00994d8d in gtk_widget_pop_composite_child () at /build/buildd/gtk+3.0-3.1.8/./gtk/gtkwidget.c:10441
No locals.
#3  0x08cb3960 in ?? ()
No symbol table info available.
Backtrace stopped: previous frame inner to this frame (corrupt stack?)