bzr crashed with AttributeError in tree_unapply_patches(): '_PreviewTree' object has no attribute 'get_revision_id'

I had 2 patches in the shelf.
The tree has patches applied (ubuntu package in launchpad, e.g. lp:ubuntu/precise/zope2.12)

Introduced in bzr-builddeb 2.8.1 is

  * Automatically unapply patches before merge operations.
    LP: #815854

Now I cannot unshelve

$ bzr unshelve
Using changes with id "2".
Unapplying quilt patches to prevent spurious conflicts
bzr: ERROR: exceptions.AttributeError: '_PreviewTree' object has no attribute 'get_revision_id'

I do not want shelve/unshelve to do anything with patches automatically.
I want it to operate in current working tree state.

bzr 2.5, bzr-builddeb 2.8.3

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: bzr 2.5.0-1ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-18.28-generic-pae 3.2.9
Uname: Linux 3.2.0-18-generic-pae i686
NonfreeKernelModules: nvidia
ApportVersion: 1.94.1-0ubuntu1
Architecture: i386
BzrDebugFlags: set()
BzrVersion: 2.5.0
CommandLine: ['/usr/bin/bzr', 'unshelve']
CrashDb: bzr
Date: Fri Mar 9 01:45:06 2012
ExecutablePath: /usr/bin/bzr
FileSystemEncoding: UTF-8
InterpreterPath: /usr/bin/python2.7
Locale: lt_LT.UTF-8
PackageArchitecture: all
Platform: Linux-3.2.0-18-generic-pae-i686-with-Ubuntu-12.04-precise
ProcCmdline: /usr/bin/python /usr/bin/bzr unshelve
PythonVersion: 2.7.2
SourcePackage: bzr
Title: bzr crashed with AttributeError in tree_unapply_patches(): '_PreviewTree' object has no attribute 'get_revision_id'
UpgradeStatus: Upgraded to precise on 2012-03-06 (2 days ago)
UserEncoding: utf-8
UserGroups: adm admin cdrom dialout dip lpadmin plugdev sambashare