bzr (0.15) di => errors :-(

[aLTer]

Hello!
I have an project managed by bzr-0.15, but after few days of work I saw:

-------------------------------------------------------------------------
$ bzr di>d.diff
bzr: ERROR: exceptions.TypeError: unsupported operand type(s) for +:
'NoneType' and 'int'

Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/bzrlib/commands.py", line
650, in run_bzr_catch_errors
    return run_bzr(argv)
  File "/usr/lib/python2.4/site-packages/bzrlib/commands.py", line
612, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.4/site-packages/bzrlib/commands.py", line
304, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.4/site-packages/bzrlib/commands.py", line
622, in ignore_pipe
    result = func(*args, **kwargs)
  File "/usr/lib/python2.4/site-packages/bzrlib/builtins.py", line 1438, in run
    old_label=old_label, new_label=new_label)
  File "/usr/lib/python2.4/site-packages/bzrlib/diff.py", line 375, in
diff_cmd_helper
    extra_trees=extra_trees)
  File "/usr/lib/python2.4/site-packages/bzrlib/diff.py", line 403, in
show_diff_trees
    extra_trees=extra_trees)
  File "/usr/lib/python2.4/site-packages/bzrlib/diff.py", line 474, in
_show_diff_trees
    old_name = '%s%s\t%s' % (old_label, path,
  File "/usr/lib/python2.4/site-packages/bzrlib/diff.py", line 488, in
_patch_header_date
    return timestamp.format_patch_date(tree.get_file_mtime(file_id, path))
  File "/usr/lib/python2.4/site-packages/bzrlib/timestamp.py", line
131, in format_patch_date
    tm = time.gmtime(secs+offset)
TypeError: unsupported operand type(s) for +: 'NoneType' and 'int'

bzr 0.15.0 on python 2.4.4.candidate.0 (linux2)
arguments: ['/usr/bin/bzr', 'di']

** please send this report to bazaar at lists.ubuntu.com
-------------------------------------------------------------------------

bzr st works fine.
Also I attached ~/.bzr.log file, maybe it will help.
Please tell me is the workaround for this error or something.
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