ibus-engine-mozc crashed with SIGABRT in g_assertion_message()

[natural966]

I'm trying Ubuntu 12.04 beta 1, an error occures.
In writing in gedit with iBus+MOZC input method, MOZC crashed (may be) after daily updated and reboot.
Error reporter let me brings here, so I don't know what happens. And now, MOZC works well.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: ibus-mozc 1.3.975.102-1
ProcVersionSignature: Ubuntu 3.2.0-18.28-generic-pae 3.2.9
Uname: Linux 3.2.0-18-generic-pae i686
NonfreeKernelModules: wl
ApportVersion: 1.94-0ubuntu2
Architecture: i386
Date: Wed Mar 7 02:23:13 2012
ExecutablePath: /usr/lib/ibus-mozc/ibus-engine-mozc
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta i386 (20120301)
ProcCmdline: /usr/lib/ibus-mozc/ibus-engine-mozc --ibus
ProcEnviron:
 PATH=(custom, user)
 LANG=ja_JP.UTF-8
 SHELL=/bin/bash
Signal: 6
SourcePackage: mozc
StacktraceTop:
 raise () from /lib/i386-linux-gnu/libc.so.6
 abort () from /lib/i386-linux-gnu/libc.so.6
 g_assertion_message () from /lib/i386-linux-gnu/libglib-2.0.so.0
 g_assertion_message_expr () from /lib/i386-linux-gnu/libglib-2.0.so.0
 ibus_prop_list_get () from /usr/lib/i386-linux-gnu/libibus-1.0.so.0
Title: ibus-engine-mozc crashed with SIGABRT in raise()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

StacktraceTop:
 g_assertion_message (domain=0xb77228f0 "IBUS", file=0xb7725093 "ibusproplist.c", line=170, func=0xb772513e "ibus_prop_list_get", message=<optimized out>) at /build/buildd/glib2.0-2.31.20/./glib/gtestutils.c:1860
 g_assertion_message_expr (domain=0xb77228f0 "IBUS", file=0xb7725093 "ibusproplist.c", line=170, func=0xb772513e "ibus_prop_list_get", expr=0xb77236eb "IBUS_IS_PROP_LIST (prop_list)") at /build/buildd/glib2.0-2.31.20/./glib/gtestutils.c:1871
 ibus_prop_list_get (prop_list=<optimized out>, index=<optimized out>) at ibusproplist.c:170
 ibus_prop_list_get (prop_list=0x0, index=0) at ibusproplist.c:167
 mozc::ibus::MozcEngine::UpdateCompositionModeIcon (this=0x9761ad8, engine=0x97678c8, new_composition_mode=mozc::commands::HALF_ASCII) at unix/ibus/mozc_engine.cc:1106

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.