Comment 7 for bug 1499133

under valgrind it shows that invalid read

==4150== 1 errors in context 1 of 1:
==4150== Invalid read of size 4
==4150== at 0x444FE59: gtk_menu_tracker_remove_items (gtkmenutracker.c:290)
==4150== by 0x444FE59: gtk_menu_tracker_model_changed (gtkmenutracker.c:451)
==4150== by 0x55D1D11: ffi_call_SYSV (sysv.S:65)
==4150== by 0x55D198B: ffi_call (ffi.c:389)
==4150== by 0x4D183AC: g_cclosure_marshal_generic (in /usr/lib/i386-linux-gnu/libgobject-2.0.so.0.4600.0)
==4150== by 0x4D17B8A: g_closure_invoke (in /usr/lib/i386-linux-gnu/libgobject-2.0.so.0.4600.0)
==4150== by 0x4D29FFB: signal_emit_unlocked_R (in /usr/lib/i386-linux-gnu/libgobject-2.0.so.0.4600.0)
==4150== by 0x4D32C95: g_signal_emit_valist (in /usr/lib/i386-linux-gnu/libgobject-2.0.so.0.4600.0)
==4150== by 0x4D32FC4: g_signal_emit (in /usr/lib/i386-linux-gnu/libgobject-2.0.so.0.4600.0)
==4150== by 0x4BF4F6B: g_menu_model_items_changed (in /usr/lib/i386-linux-gnu/libgio-2.0.so.0.4600.0)
==4150== by 0x4BF852D: g_dbus_menu_group_changed (in /usr/lib/i386-linux-gnu/libgio-2.0.so.0.4600.0)
==4150== by 0x4BF8C07: g_dbus_menu_path_signal (in /usr/lib/i386-linux-gnu/libgio-2.0.so.0.4600.0)
==4150== by 0x4C10DCE: emit_signal_instance_in_idle_cb (in /usr/lib/i386-linux-gnu/libgio-2.0.so.0.4600.0)
==4150== by 0x4DAC40F: g_idle_dispatch (in /lib/i386-linux-gnu/libglib-2.0.so.0.4600.0)
==4150== by 0x4DAFB9A: g_main_context_dispatch (in /lib/i386-linux-gnu/libglib-2.0.so.0.4600.0)
==4150== by 0x4DAFF88: g_main_context_iterate.isra.29 (in /lib/i386-linux-gnu/libglib-2.0.so.0.4600.0)
==4150== by 0x4DB0338: g_main_loop_run (in /lib/i386-linux-gnu/libglib-2.0.so.0.4600.0)
==4150== by 0x442F99D: gtk_main (gtkmain.c:1219)
==4150== by 0x804C313: main (in /usr/lib/unity/unity-panel-service)