quasselclient crashed with SIGSEGV in QObject::thread()

[darthanubis]

 kquitapp plasmashell; sleep 2; plasmashell

Then quassel client crashed.

ProblemType: Crash
DistroRelease: Ubuntu 15.04
Package: quassel-client 0.12~rc1-0ubuntu2
ProcVersionSignature: Ubuntu 3.19.0-12.12-generic 3.19.3
Uname: Linux 3.19.0-12-generic x86_64
ApportVersion: 2.17-0ubuntu2
Architecture: amd64
CurrentDesktop: KDE
Date: Fri Apr 10 13:35:47 2015
ExecutablePath: /usr/bin/quasselclient
InstallationDate: Installed on 2015-03-22 (19 days ago)
InstallationMedia: Kubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20150320)
ProcCmdline: /usr/bin/quasselclient
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/zsh
SegvAnalysis:
 Segfault happened at: 0x7fa3786e90c3: cmp 0x8(%rbx),%ebp
 PC (0x7fa3786e90c3) ok
 source "0x8(%rbx)" (0x650072006f004b) not located in a known VMA region (needed readable region)!
 destination "%ebp" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: quassel
StacktraceTop:
 QObject::thread() const () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
 QObject::QObject(QObject*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
 DBusMenuExporter::DBusMenuExporter(QString const&, QMenu*, QDBusConnection const&) () from /usr/lib/x86_64-linux-gnu/libdbusmenu-qt5.so.2
 KStatusNotifierItem::setContextMenu(QMenu*) () from /usr/lib/x86_64-linux-gnu/libKF5Notifications.so.5
 ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
Title: quasselclient crashed with SIGSEGV in QObject::thread()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

StacktraceTop:
 QObject::thread (this=this@entry=0x7fa37a179090) at kernel/qobject.cpp:1412
 QObject::QObject (this=0x7fa37dbb0db0, parent=0x7fa37a179090) at kernel/qobject.cpp:808
 DBusMenuExporter::DBusMenuExporter(QString const&, QMenu*, QDBusConnection const&) () from /tmp/apport_sandbox_A9Av3S/usr/lib/x86_64-linux-gnu/libdbusmenu-qt5.so.2
 KStatusNotifierItem::setContextMenu (this=0x7fa37b9363d0, menu=0x7fa37a179090) at ../../src/kstatusnotifieritem.cpp:403
 QSystemTrayIconPrivate::install_sys_qpa (this=this@entry=0x7fa37a172120) at util/qsystemtrayicon.cpp:684