kactivitymanagerd crashed with SIGABRT in QMessageLogger::fatal()

After installing Gwenview on >>Ubuntu<< 15.10 and starting it to view an image, a crash dialogue popped-up.

ProblemType: Crash
DistroRelease: Ubuntu 15.10
Package: kactivities 5.15.0-0ubuntu1
ProcVersionSignature: Ubuntu 4.2.0-15.18-generic 4.2.3
Uname: Linux 4.2.0-15-generic x86_64
ApportVersion: 2.19.1-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Oct 9 16:17:03 2015
ExecutablePath: /usr/bin/kactivitymanagerd
InstallationDate: Installed on 2014-12-17 (295 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
ProcCmdline: /usr/bin/kactivitymanagerd start-daemon
Signal: 6
SourcePackage: kactivities-kf5
StacktraceTop:
 QMessageLogger::fatal(char const*, ...) const () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
 QWidgetPrivate::init(QWidget*, QFlags<Qt::WindowType>) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
 QDesktopWidget::QDesktopWidget() () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
 QApplication::desktop() () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
 ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/kf5/org.kde.kwindowsystem.platforms/KF5WindowSystemX11Plugin.so
Title: kactivitymanagerd crashed with SIGABRT in QMessageLogger::fatal()
UpgradeStatus: Upgraded to wily on 2015-05-10 (151 days ago)
UserGroups: adm cdrom dip libvirtd lpadmin plugdev sambashare sudo