Comment 2 for bug 864714

StacktraceTop:
 nux::GraphicsDisplay::GetGpuDevice (this=0x0) at ./GraphicsDisplayX11.cpp:676
 texture_from_cairo_graphics (cg=<optimized out>) at /build/buildd/unity-4.20.0/plugins/unityshell/src/CairoTexture.h:41
 nux::StaticCairoText::UpdateTexture (this=0x329aa60) at /build/buildd/unity-4.20.0/plugins/unityshell/src/StaticCairoText.cpp:490
 nux::StaticCairoText::OnFontChanged (gobject=<optimized out>, pspec=<optimized out>, data=<optimized out>) at /build/buildd/unity-4.20.0/plugins/unityshell/src/StaticCairoText.cpp:505
 g_closure_invoke (closure=0x3867420, return_value=0x0, n_param_values=2, param_values=0x3fccad0, invocation_hint=<optimized out>) at /build/buildd/glib2.0-2.30.0/./gobject/gclosure.c:774