push to http+webdav (with WebDAV server on Android) crashes

The WebDAV server is "Servers Ultimate" (https://play.google.com/store/apps/details?id=com.icecoldapps.serversultimate) on Android 4.2.2, running on local network with user authentication, without SSL.

The Bazaar client is 2.5.1-1 for Windows. Also tried 2.6b1-1 with the same result. The stderr output follows ...

HTTP 192.168.0.2:7835, Realm: 'SomeDAV' username: ******
HTTP ******@192.168.0.2:7835, Realm: 'SomeDAV' password:

bzr: ERROR: exceptions.ValueError: invalid literal for int() with base 10: ''

Traceback (most recent call last):
  File "bzrlib\commands.pyo", line 920, in exception_to_return_code
  File "bzrlib\commands.pyo", line 1131, in run_bzr
  File "bzrlib\commands.pyo", line 673, in run_argv_aliases
  File "bzrlib\commands.pyo", line 695, in run
  File "bzrlib\cleanup.pyo", line 136, in run_simple
  File "bzrlib\cleanup.pyo", line 166, in _do_with_cleanups
  File "bzrlib\builtins.pyo", line 1379, in run
  File "bzrlib\push.pyo", line 94, in _show_push_branch
  File "bzrlib\branch.pyo", line 1437, in create_clone_on_transport
  File "bzrlib\bzrdir.pyo", line 194, in clone_on_transport
  File "bzrlib\bzrdir.pyo", line 1420, in initialize_on_transport_ex
  File "bzrlib\bzrdir.pyo", line 1334, in initialize_on_transport
  File "bzrlib\bzrdir.pyo", line 1453, in _initialize_on_transport_vfs
  File "bzrlib\lockable_files.pyo", line 74, in __init__
  File "bzrlib\lockable_files.pyo", line 120, in _find_modes
  File "C:/pwa/bazaar/plugins\webdav\webdav.py", line 779, in stat
  File "C:/pwa/bazaar/plugins\webdav\webdav.py", line 239, in _extract_stat_info
  File "xml\sax\expatreader.pyo", line 107, in parse
  File "xml\sax\xmlreader.pyo", line 123, in parse
  File "xml\sax\expatreader.pyo", line 207, in feed
  File "xml\sax\expatreader.pyo", line 304, in end_element
  File "C:/pwa/bazaar/plugins\webdav\webdav.py", line 149, in endElement
ValueError: invalid literal for int() with base 10: ''

bzr 2.5.1 on python 2.6.6 (Windows-7-6.1.7601-SP1)
arguments: ['c:\\pwa\\bazaar\\bzr.EXE', 'push', '--use-existing-dir',
    'http+webdav://192.168.0.2:7835/bzr_Audrey']
plugins: bzrtools[2.5.0], explorer[1.2.2], fastimport[0.14.0dev],
    launchpad[2.5.1], qbzr[0.22.3], rewrite[0.6.4dev], upload[1.2.0dev],
    webdav[2.5.0], xmloutput[0.8.8]
encoding: 'cp1250', fsenc: 'mbcs', lang: None

*** Bazaar has encountered an internal error. This probably indicates a
    bug in Bazaar. You can help us fix it by filing a bug report at
        https://bugs.launchpad.net/bzr/+filebug
    including this traceback and a description of the problem.