Comment 2 for bug 835259

StacktraceTop:
 PluginClassHandler<UnityWindow, CompWindow, 0>::get (base=0x0) at /usr/include/compiz/core/pluginclasshandler.h:205
 end (this=0x7fff5b253e30) at /build/buildd/unity-4.10.2/plugins/unityshell/src/unityshell.cpp:2142
 end<std::vector<boost::shared_ptr<unity::ui::LayoutWindow> > > (__cont=...) at /usr/include/c++/4.6/bits/range_access.h:69
 UnityScreen::paintDisplay (this=0x2350380, region=<optimized out>, transform=<optimized out>, mask=<optimized out>) at /build/buildd/unity-4.10.2/plugins/unityshell/src/unityshell.cpp:460
 UnityWindow::glDraw (this=0x42e9820, matrix=..., attrib=..., region=..., mask=65536) at /build/buildd/unity-4.10.2/plugins/unityshell/src/unityshell.cpp:1362