#0  g_type_check_instance_cast (type_instance=0x1d00c20, iface_type=26170992) at /build/buildd/glib2.0-2.31.20/./gobject/gtype.c:3999
        node = 0x7fffc8c91ca0
        iface = 0x0
        is_instantiatable = <optimized out>
        check = <optimized out>
#1  0x00007f2b983594d3 in ?? ()
No symbol table info available.
#2  0x0000000000000001 in ?? ()
No symbol table info available.
#3  0x00007f2ba327aa75 in g_value_peek_pointer (value=0x1d00c20) at /build/buildd/glib2.0-2.31.20/./gobject/gvalue.c:317
        value_table = <optimized out>
        __PRETTY_FUNCTION__ = "g_value_peek_pointer"
#4  0x00000000004123f0 in gtk_window_set_modal@plt ()
No symbol table info available.
#5  0x0000000000000001 in ?? ()
No symbol table info available.
#6  0x0000000000000000 in ?? ()
No symbol table info available.