do-release-upgrade crashed with SIGSEGV in debVersioningSystem::CheckDep()

This appeared while apt-get update was running. The update completed anyway

ProblemType: Crash
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.216
ProcVersionSignature: Ubuntu 3.13.0-17.37-generic 3.13.6
Uname: Linux 3.13.0-17-generic x86_64
ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
CrashDB: ubuntu
Date: Fri Mar 14 06:24:08 2014
ExecutablePath: /usr/bin/do-release-upgrade
InstallationDate: Installed on 2013-12-17 (85 days ago)
InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20131217)
InterpreterPath: /usr/bin/python3.4
PackageArchitecture: all
ProcCmdline: /usr/bin/python3 /usr/lib/ubuntu-release-upgrader/check-new-release -q
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
SegvAnalysis:
 Segfault happened at: 0x7fdb05ada7d2 <_ZN19debVersioningSystem8CheckDepEPKciS1_+34>: cmpb $0x0,(%rsi)
 PC (0x7fdb05ada7d2) ok
 source "$0x0" ok
 destination "(%rsi)" (0x7fdbffffffff) not located in a known VMA region (needed writable region)!
SegvReason: writing unknown VMA
Signal: 11
SourcePackage: ubuntu-release-upgrader
StacktraceTop:
 debVersioningSystem::CheckDep(char const*, int, char const*) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
 pkgDepCache::CheckDep(pkgCache::DepIterator, int, pkgCache::PkgIterator&) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
 pkgDepCache::DependencyState(pkgCache::DepIterator&) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
 pkgDepCache::Update(OpProgress*) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
 pkgDepCache::Init(OpProgress*) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
Title: do-release-upgrade crashed with SIGSEGV in debVersioningSystem::CheckDep()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: