abrt version: 1.1.13
architecture: x86_64
cmdline: python /usr/share/ibus-anthy/engine/main.py --ibus
component: ibus-anthy
executable: /usr/share/ibus-anthy/engine/main.py
kernel: 2.6.35.6-46.fc14.x86_64
package: ibus-anthy-1.2.3-2.fc14
reason: segment.py:72:to_half_width_katakana:UnicodeDecodeError: 'utf8' codec can't decode byte 0xe3 in position 0: unexpected end of data
release: Fedora release 14 (Laughlin)
time: 1287668353
uid: 500

backtrace
-----
segment.py:72:to_half_width_katakana:UnicodeDecodeError: 'utf8' codec can't decode byte 0xe3 in position 0: unexpected end of data

Traceback (most recent call last):
  File "/usr/share/ibus-anthy/engine/engine.py", line 990, in __update
    self.__update_convert_chars()
  File "/usr/share/ibus-anthy/engine/engine.py", line 923, in __update_convert_chars
    text, cursor = self.__preedit_ja_string.get_half_width_katakana(True)
  File "/usr/share/ibus-anthy/engine/jastring.py", line 239, in get_half_width_katakana
    text_before = R(u"".join(map(conv, self.__segments[:self.__cursor])))
  File "/usr/share/ibus-anthy/engine/jastring.py", line 237, in <lambda>
    conv = lambda s: s.to_half_width_katakana()
  File "/usr/share/ibus-anthy/engine/segment.py", line 72, in to_half_width_katakana
    return u"".join(map(lambda c: hiragana_katakana_table.get(c, (c, c, c))[1], self._jachars))
UnicodeDecodeError: 'utf8' codec can't decode byte 0xe3 in position 0: unexpected end of data

Local variables in innermost frame:
self: <romaji.RomajiSegment object at 0x221f610>

comment
-----
When it crash once, it didn't crash next time, also if I restart ibus and do test steps again, I can reproduce it.

How to reproduce
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1.Enable Japanese input mode. e.g. push Hankaku_Zenkaku key.
2.Type a as "あ".
3.Push F8 key to convert hankaku kana.