UnicodeDecodeError on 'log -p'

'log -p' have problems with files encoding.
'diff' works fine to show the patch.

$ bzr log -p -r-2
------------------------------------------------------------
revno: 1111
committer: XXX
branch nick: XXX
timestamp: Tue 2009-02-10 12:37:09 +0100
message:
  XXX
diff:
=== modified file 'file'
--- file 2009-02-04 17:44:37 +0000
+++ file 2009-02-10 11:37:09 +0000
@@ -470,4 +470,123 @@
 RewriteRule AAA BBB [R=301,L,NE]

 RewriteRule "CCC" "DDD" [NE,QSA,L,R=301]
+
+
+
bzr: ERROR: exceptions.UnicodeDecodeError: 'ascii' codec can't decode byte 0xe0 in position 50: ordinal not in range(128)

Traceback (most recent call last):
  File "/opt/lib/python/bzrlib/commands.py", line 893, in run_bzr_catch_errors
    return run_bzr(argv)
  File "/opt/lib/python/bzrlib/commands.py", line 839, in run_bzr
    ret = run(*run_argv)
  File "/opt/lib/python/bzrlib/commands.py", line 539, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/opt/lib/python/bzrlib/commands.py", line 853, in ignore_pipe
    result = func(*args, **kwargs)
  File "/opt/lib/python/bzrlib/builtins.py", line 1950, in run
    show_diff=show_diff)
  File "/opt/lib/python/bzrlib/log.py", line 182, in show_log
    start_revision, end_revision, search, limit, show_diff)
  File "/opt/lib/python/bzrlib/log.py", line 239, in _show_log
    lf.log_revision(lr)
  File "/opt/lib/python/bzrlib/log.py", line 1248, in log_revision
    self.show_diff(to_file, revision.diff, indent)
  File "/opt/lib/python/bzrlib/log.py", line 1193, in show_diff
    to_file.write(indent + '%s\n' % (l,))
  File "/opt/lib/python/codecs.py", line 303, in write
    data, consumed = self.encode(object, self.errors)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe0 in position 50: ordinal not in range(128)

bzr 1.12rc1 on python 2.5.2 (linux2)
arguments: ['/opt/bin/bzr', '--no-plugins', 'log', '-p']
encoding: 'ISO-8859-1', fsenc: 'ISO-8859-1', lang: 'en_US'
plugins:
*** Bazaar has encountered an internal error.
    Please report a bug at https://bugs.launchpad.net/bzr/+filebug
    including this traceback, and a description of what you
    were doing when the error occurred.