Comment 2 for bug 868868

StacktraceTop:
 unity::PanelTray::FilterTrayCallback (tray=0x8ece848, icon=0x8e63320, self=0x8ec80b0) at /build/buildd/unity-4.22.0/plugins/unityshell/src/PanelTray.cpp:160
 tray_added (manager=0x87598f8, icon=0x8e63320, trays_screen=0x8ece6b0) at na-tray.c:216
 g_cclosure_marshal_VOID__OBJECT (closure=0x81e71e8, return_value=0x0, n_param_values=2, param_values=0x87652a0, invocation_hint=0xbfe3b0f0, marshal_data=0x0) at /build/buildd/glib2.0-2.30.0/./gobject/gmarshal.c:644
 g_closure_invoke (closure=0x81e71e8, return_value=0x0, n_param_values=2, param_values=0x87652a0, invocation_hint=0xbfe3b0f0) at /build/buildd/glib2.0-2.30.0/./gobject/gclosure.c:774
 signal_emit_unlocked_R (node=0x8ecf6f0, detail=0, instance=0x87598f8, emission_return=0x0, instance_and_params=0x87652a0) at /build/buildd/glib2.0-2.30.0/./gobject/gsignal.c:3272