software-center crashed with IndexError in _on_total_size_calculation_done(): list index out of range

Trying to install Plex Media Server app from a downloaded debian package. I also recieved a "bad software quality" error at this time.

ProblemType: Crash
DistroRelease: Ubuntu 12.10
Package: software-center 5.4
ProcVersionSignature: Ubuntu 3.5.0-17.27-generic 3.5.5
Uname: Linux 3.5.0-17-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 2.6.1-0ubuntu1
Architecture: i386
CrashCounter: 1
Date: Fri Oct 5 18:32:38 2012
ExecutablePath: /usr/share/software-center/software-center
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/software-center /home/username/Downloads/plexmediaserver_0.9.6.9.240-8fd9c6a_i386.deb
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/software-center', '/home/username/Downloads/plexmediaserver_0.9.6.9.240-8fd9c6a_i386.deb']
SourcePackage: software-center
Title: software-center crashed with IndexError in _on_total_size_calculation_done(): list index out of range
Traceback:
 Traceback (most recent call last):
   File "/usr/share/software-center/softwarecenter/db/pkginfo_impl/aptcache.py", line 585, in _on_total_size_calculation_done
     pkgname = trans.packages[0][0]
 IndexError: list index out of range
UpgradeStatus: Upgraded to quantal on 2012-10-05 (0 days ago)
UserGroups: adm cdrom dip lpadmin netdev plugdev sambashare sudo