compiz crashed with SIGSEGV in PanelView::~PanelView()

[Vasyl Priymachuk]

Binary package hint: unity

When i disable second display (VGA cable), compiz crashed

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: libnux-0.9-0 0.9.44-0ubuntu2
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
Architecture: amd64
CrashCounter: 1
Date: Tue Apr 19 00:13:02 2011
ExecutablePath: /usr/bin/compiz
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110302)
ProcCmdline: compiz
ProcEnviron:
 LANGUAGE=uk:en
 LANG=uk_UA.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x21c12e0: je 0x21c1347
 PC (0x021c12e0) in non-executable VMA region: 0x0090e000-0x02efa000 rw-p [heap]
 source "0x21c1347" (0x021c1347) ok
SegvReason: executing writable VMA [heap]
Signal: 11
SourcePackage: nux
StacktraceTop:
 ?? ()
 PanelView::~PanelView() () from /usr/lib/compiz/libunityshell.so
 PanelView::~PanelView() () from /usr/lib/compiz/libunityshell.so
 nux::Object::Destroy() () from /usr/lib/libnux-core-0.9.so.0
 nux::Object::UnReference() () from /usr/lib/libnux-core-0.9.so.0
Title: compiz crashed with SIGSEGV in PanelView::~PanelView()
UpgradeStatus: Upgraded to natty on 2011-03-26 (23 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
XsessionErrors:
 (<unknown>:1875): dee-WARNING **: Transaction from com.canonical.Unity.ApplicationsPlace.SectionsModel is in the past. Ignoring transaction.
 (<unknown>:1875): dee-WARNING **: Transaction from com.canonical.Unity.ApplicationsPlace.GroupsModel is in the past. Ignoring transaction.
 (<unknown>:1875): GLib-CRITICAL **: g_markup_escape_text: assertion `text != NULL' failed
 (process:4322): Gtk-WARNING **: Locale not supported by C library.
 (<unknown>:1875): Gtk-CRITICAL **: IA__gtk_widget_get_realized: assertion `GTK_IS_WIDGET (widget)' failed

[Apport retracing service (apport)]

StacktraceTop:
 ?? ()
 PanelView::~PanelView (this=0x1bee8a0, __in_chrg=<value optimized out>) at /build/buildd/unity-3.8.8/src/PanelView.cpp:90
 PanelView::~PanelView (this=0x1bee8a0, __in_chrg=<value optimized out>) at /build/buildd/unity-3.8.8/src/PanelView.cpp:97
 nux::Object::Destroy (this=0x1bee8b8) at ./Object.cpp:430
 nux::Object::UnReference (this=0x1bee8b8) at ./Object.cpp:333