software-center crashed with DatabaseModifiedError in _database_gen_postlist_iter(): The revision being read has been discarded - you should call Xapian::Database::reopen() and retry the operation

error occurred after conky install from synaptic package manager.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: software-center 5.1.3.1
ProcVersionSignature: Ubuntu 3.2.0-3.9-generic 3.2.0-rc4
Uname: Linux 3.2.0-3-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.90-0ubuntu1
Architecture: amd64
Date: Sat Dec 10 05:39:59 2011
ExecutablePath: /usr/share/software-center/software-center
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Release Candidate amd64 (20100419.1)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/software-center
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/software-center']
SoftwareCenterLog:
 2011-12-10 05:33:24,149 - softwarecenter.ui.gtk3.em - INFO - EM's: 17 13 20
 2011-12-10 05:33:27,816 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file
 2011-12-10 05:33:28,218 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for ambiance Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css
 2011-12-10 05:33:34,327 - softwarecenter.ui.gtk3.app - INFO - software-center-agent finished with status 0
SourcePackage: software-center
Title: software-center crashed with DatabaseModifiedError in _database_gen_postlist_iter(): The revision being read has been discarded - you should call Xapian::Database::reopen() and retry the operation
UpgradeStatus: Upgraded to precise on 2011-12-10 (0 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare