Comment 2 for bug 1564128

StacktraceTop:
 __shared_ptr (this=0xb4b9198) at /usr/include/c++/5/bits/shared_ptr_base.h:923
 shared_ptr (this=0xb4b9198) at /usr/include/c++/5/bits/shared_ptr.h:107
 unity::panel::PanelView::PanelView (this=0xb4b8c50, parent=0xa91fe80, menus=..., __Nux_FileName__=0x7f6a99891598 "/build/unity-S0BzK0/unity-7.4.0+16.04.20160322/panel/PanelView.h", __Nux_LineNumber__=55) at /build/unity-S0BzK0/unity-7.4.0+16.04.20160322/panel/PanelView.cpp:62
 unity::panel::Controller::Impl::CreatePanel (this=this@entry=0x5847e20) at /build/unity-S0BzK0/unity-7.4.0+16.04.20160322/panel/PanelController.cpp:183
 unity::panel::Controller::Impl::OnScreenChanged (this=0x5847e20, primary_monitor=<optimized out>, monitors=...) at /build/unity-S0BzK0/unity-7.4.0+16.04.20160322/panel/PanelController.cpp:142