bzr crash InvalidEntryName backslash

Bzr has crashed when adding files to branch:

$ bzr add
...
...
added "rady/Projektovani informacnich systemu II 2007\2008.desktop"
bzr: ERROR: bzrlib.errors.InvalidEntryName: Invalid entry name: Projektovani informacnich systemu II 2007\2008.desktop

Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 857, in run_bzr_catch_errors
    return run_bzr(argv)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 797, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 499, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.5/site-packages/bzrlib/builtins.py", line 387, in run
    no_recurse, action=action, save=not dry_run)
  File "/usr/lib/python2.5/site-packages/bzrlib/mutabletree.py", line 52, in tree_write_locked
    return unbound(self, *args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/mutabletree.py", line 406, in smart_add
    _add_one(self, inv, parent_ie, directory, kind, action)
  File "/usr/lib/python2.5/site-packages/bzrlib/mutabletree.py", line 574, in _add_one
    file_id=file_id)
  File "/usr/lib/python2.5/site-packages/bzrlib/inventory.py", line 986, in make_entry
    return make_entry(kind, name, parent_id, file_id)
  File "/usr/lib/python2.5/site-packages/bzrlib/inventory.py", line 1313, in make_entry
    return factory(file_id, name, parent_id)
  File "/usr/lib/python2.5/site-packages/bzrlib/inventory.py", line 535, in __init__
    super(InventoryFile, self).__init__(file_id, name, parent_id)
  File "/usr/lib/python2.5/site-packages/bzrlib/inventory.py", line 216, in __init__
    raise errors.InvalidEntryName(name=name)
InvalidEntryName: Invalid entry name: Projektovani informacnich systemu II 2007\2008.desktop

bzr 1.6.1 on python 2.5.2 (linux2)
arguments: ['/usr/bin/bzr', 'add']
encoding: 'UTF-8', fsenc: 'UTF-8', lang: 'cs_CZ.UTF-8'
plugins:
  launchpad /usr/lib/python2.5/site-packages/bzrlib/plugins/launchpad [unknown]
*** 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.
$

I guess it's crashing on backslash in file name.