Comment 2 for bug 1034429

Stacktrace:

#0 g_list_find (list=0x501d42e9, data=0x1400adf)
    at /build/buildd/glib2.0-2.32.3/./glib/glist.c:705
#1 0xb7781678 in bamf_application_on_window_added (proxy=0x91b5450,
    path=0x9215358 "/org/ayatana/bamf/window20974303", self=0x91b0560)
    at /build/buildd/bamf-0.2.118/./lib/libbamf/bamf-application.c:367
#2 0xb75e7013 in g_cclosure_marshal_VOID__STRING (closure=0x909e268,
    return_value=0x0, n_param_values=2, param_values=0x91175a8,
    invocation_hint=0xbff35640, marshal_data=0x0)
    at /build/buildd/glib2.0-2.32.3/./gobject/gmarshal.c:964
#3 0xb726117a in marshal_dbus_message_to_g_marshaller (closure=0x909e268,
    return_value=0x0, n_param_values=3, param_values=0xbff356c0,
    invocation_hint=0xbff35640, marshal_data=0x0) at dbus-gproxy.c:1734
#4 0xb75e4484 in g_closure_invoke (closure=0x909e268, return_value=0x0,
    n_param_values=3, param_values=0xbff356c0, invocation_hint=0xbff35640)
    at /build/buildd/glib2.0-2.32.3/./gobject/gclosure.c:777
#5 0xb75f60d9 in signal_emit_unlocked_R (node=0x9013440, detail=348,
    instance=0x91b5450, emission_return=0x0, instance_and_params=0xbff356c0)
    at /build/buildd/glib2.0-2.32.3/./gobject/gsignal.c:3547
#6 0xb75fe2dc in g_signal_emit_valist (instance=0x91b5450, signal_id=15,
    detail=348, var_args=0xbff358e4 "")
    at /build/buildd/glib2.0-2.32.3/./gobject/gsignal.c:3296
#7 0xb75fe453 in g_signal_emit (instance=0x91b5450, signal_id=15, detail=348)
    at /build/buildd/glib2.0-2.32.3/./gobject/gsignal.c:3352
#8 0xb7261820 in dbus_g_proxy_emit_remote_signal (message=0x9217c00,
    proxy=<optimized out>) at dbus-gproxy.c:1787
#9 dbus_g_proxy_manager_filter (user_data=0x9007c80, message=0x9217c00,
    connection=<optimized out>) at dbus-gproxy.c:1354
#10 dbus_g_proxy_manager_filter (connection=0x900cf58, message=0x9217c00,
    user_data=0x9007c80) at dbus-gproxy.c:1195
#11 0xb7172441 in ?? () at ../../dbus/dbus-connection.c:5632
   from /lib/i386-linux-gnu/libdbus-1.so.3