apport-gtk crashed with AssertionError in return_value()

[Kevin Fischer]

Crashed after login post upgrade to vivid beta

ProblemType: Crash
DistroRelease: Ubuntu 15.04
Package: apport-gtk 2.16.2-0ubuntu2
ProcVersionSignature: Ubuntu 3.16.0-25.33-generic 3.16.7
Uname: Linux 3.16.0-25-generic x86_64
NonfreeKernelModules: nvidia
ApportLog:

ApportVersion: 2.16.2-0ubuntu2
Architecture: amd64
CrashReports:
 640:0:114:1026427:2015-03-10 16:49:50.207894563 -0500:2015-03-10 16:49:51.207894563 -0500:/var/crash/avahi-daemon.0.crash
 640:0:114:1014119:2015-03-10 16:50:06.007414817 -0500:2015-03-10 16:50:07.007414817 -0500:/var/crash/rsyslog.0.crash
 640:0:114:58925:2015-03-10 16:50:06.767776727 -0500:2015-03-10 16:50:07.767776727 -0500:/var/crash/_usr_share_apport_apport-gtk.0.crash
 640:0:114:170585:2015-03-09 23:05:03.895692510 -0500:2015-03-09 23:05:03.755700742 -0500:/var/crash/_usr_bin_Xorg.0.crash
Date: Tue Mar 10 16:49:51 2015
ExecutablePath: /usr/share/apport/apport-gtk
InstallationDate: Installed on 2014-04-12 (332 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
InterpreterPath: /usr/bin/python3.4
PackageArchitecture: all
ProcCmdline: /usr/bin/python3 /usr/share/apport/apport-gtk
ProcEnviron:
 SHELL=/bin/bash
 LANG=en_US.UTF-8
 LANGUAGE=en_US
 PATH=(custom, no user)
PythonArgs: ['/usr/share/apport/apport-gtk']
SourcePackage: apport
Title: apport-gtk crashed with AssertionError in return_value()
UpgradeStatus: Upgraded to vivid on 2015-03-10 (0 days ago)
UserGroups:

[Kevin Fischer (fisch)]

Happy to give any additional info you need. Issue does not seem to cause any problems, aside from the bug report popping up.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Josef Andersson (northar)]

Get the same error when upgrading to ww.