systemsettings5 crashed with SIGSEGV in QObjectData::dynamicMetaObject()

[PhotonQyv]

I was just updating the picture that I wanted to use on the lock screen, and the startup/shutdown screen, when system settings crashed.

ProblemType: Crash
DistroRelease: Ubuntu 18.04
Package: systemsettings 4:5.12.4-0ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-15.16-generic 4.15.15
Uname: Linux 4.15.0-15-generic x86_64
ApportVersion: 2.20.9-0ubuntu5
Architecture: amd64
CurrentDesktop: KDE
Date: Sat Apr 14 17:49:11 2018
ExecutablePath: /usr/bin/systemsettings5
InstallationDate: Installed on 2018-04-10 (4 days ago)
InstallationMedia: Kubuntu 18.04 LTS "Bionic Beaver" - Beta amd64 (20180404)
ProcCmdline: /usr/bin/systemsettings5
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
Signal: 11
SourcePackage: systemsettings
StacktraceTop:
 __GI_raise (sig=<optimised out>) at ../sysdeps/unix/sysv/linux/raise.c:51
 KCrash::defaultCrashHandler(int) () at /usr/lib/x86_64-linux-gnu/libKF5Crash.so.5
 <signal handler called> () at /lib/x86_64-linux-gnu/libc.so.6
 ()
 QObjectData::dynamicMetaObject() const () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
Title: systemsettings5 crashed with SIGSEGV in __GI_raise()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip libvirt lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

StacktraceTop:
 ?? ()
 QObjectData::dynamicMetaObject (this=<optimized out>) at kernel/qobject.cpp:203
 QMetaObject::cast (this=0x7fabfab29540 <QWidgetWindow::staticMetaObject>, obj=obj@entry=0x55d7db6d1aa0) at kernel/qmetaobject.cpp:366
 QMetaObject::cast (this=<optimized out>, obj=obj@entry=0x55d7db6d1aa0) at kernel/qmetaobject.cpp:355
 qobject_cast<QWidgetWindow*> (object=0x55d7db6d1aa0) at ../../include/QtCore/../../src/corelib/kernel/qobject.h:514

[Launchpad Janitor (janitor)]

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