unity-applications-daemon crashed with SIGABRT in raise()

Binary package hint: unity-place-applications

happend when i closed unity-applications-daemon normaly. It closed and everything just gave me this error.

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: unity-place-applications 0.2.42-0ubuntu2
ProcVersionSignature: Ubuntu 2.6.38-7.39-generic 2.6.38
Uname: Linux 2.6.38-7-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Sun Mar 27 10:08:12 2011
ExecutablePath: /usr/lib/unity-place-applications/unity-applications-daemon
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110322.1)
ProcCmdline: /usr/lib/unity-place-applications/unity-applications-daemon
ProcEnviron:
 SHELL=/bin/bash
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
Signal: 6
SourcePackage: unity-place-applications
StacktraceTop:
 usernameise () from /lib/x86_64-linux-gnu/libc.so.6
 abort () from /lib/x86_64-linux-gnu/libc.so.6
 __gnu_cxx::__verbose_terminate_handler() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
 ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
 std::terminate() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
Title: unity-applications-daemon crashed with SIGABRT in raise()
UpgradeStatus: Upgraded to natty on 2011-03-26 (0 days ago)
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