unity-panel-service crashed with SIGSEGV

This happens on the first click in the unity-panel after logging on.

ProblemType: Crash
DistroRelease: Ubuntu 15.04
Package: unity-services 7.3.1+15.04.20150126-0ubuntu1
ProcVersionSignature: Ubuntu 3.18.0-11.12-generic 3.18.3
Uname: Linux 3.18.0-11-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.15.1-0ubuntu4
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CurrentDesktop: Unity
Date: Thu Jan 29 11:17:30 2015
ExecutablePath: /usr/lib/unity/unity-panel-service
InstallationDate: Installed on 2009-12-08 (1877 days ago)
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
ProcCmdline: /usr/lib/unity/unity-panel-service
Registers: No symbol "__nih_abort_msg" in current context.
SegvAnalysis: Failure: invalid literal for int() with base 16: 'symbol'
Signal: 11
SourcePackage: unity
StacktraceTop:

ThreadStacktrace: $7 = 0x4 <error: Cannot access memory at address 0x4>
Title: unity-panel-service crashed with SIGSEGV
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout disk fuse lpadmin plugdev sambashare