Comment 2 for bug 963718

StacktraceTop:
 g_variant_unref (value=0xfffffff9) at /build/buildd/glib2.0-2.31.22/./glib/gvariant-core.c:622
 unity::launcher::SoftwareCenterLauncherIcon::OnPropertyChanged (this=0xaeeccb8, params=0xafc604b0) at /build/buildd/unity-5.8.0/plugins/unityshell/src/SoftwareCenterLauncherIcon.cpp:71
 operator() (this=0xa9dc99c, _A_a1=<optimized out>) at /usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1851
 operator()<_GVariant* const&> (this=0xa9dc998, _A_arg1=<optimized out>) at /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:84
 sigc::internal::slot_call1<sigc::bound_mem_functor1<void, unity::launcher::SoftwareCenterLauncherIcon, _GVariant*>, void, _GVariant*>::call_it (rep=0xa9dc980, a_1=@0xbfcfeb70) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:137