kactivitymanagerd crash when ending kwin in LXQt; journalctl & gdb output

coredumpctl_gdb_kactivitymanagerd_crash.log

 $ sudo coredumpctl gdb                
           PID: 3122 (kactivitymanage)
           UID: 1000 (kf4btg)
           GID: 100 (users)
        Signal: 6 (ABRT)
     Timestamp: Mon 2015-10-05 15:47:25 EDT (42s ago)
  Command Line: /usr/bin/kactivitymanagerd start-daemon
    Executable: /usr/bin/kactivitymanagerd
 Control Group: /user.slice/user-1000.slice/session-c1.scope
          Unit: session-c1.scope
         Slice: user-1000.slice
       Session: c1
     Owner UID: 1000 (kf4btg)
       Boot ID: 32998fc25e1e49ad9df4c37e9a620b2b
    Machine ID: dd4394eec244453fbacba5f15e14141e
      Hostname: jarmano
      Coredump: /var/lib/systemd/coredump/core.kactivitymanage.1000.32998fc25e1e49ad9df4c37e9a620b2b.3122.1444074445000000.lz4
       Message: Process 3122 (kactivitymanage) of user 1000 dumped core.

GNU gdb (GDB) 7.10

<snip header>

Reading symbols from /usr/bin/kactivitymanagerd...(no debugging symbols found)...done.

warning: core file may not match specified executable file.
[New LWP 3122]
[New LWP 3124]
[New LWP 3170]
[New LWP 3171]
[New LWP 3123]

warning: Could not load shared library symbols for linux-vdso.so.1.
Do you need "set solib-search-path" or "set sysroot"?
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
Core was generated by `/usr/bin/kactivitymanagerd start-daemon'.
Program terminated with signal SIGABRT, Aborted.
#0  0x00007f715b8bf5f8 in raise () from /usr/lib/libc.so.6
[Current thread is 1 (Thread 0x7f715dfc2800 (LWP 3122))]
(gdb) bt
#0  0x00007f715b8bf5f8 in raise () from /usr/lib/libc.so.6
#1  0x00007f715b8c0a7a in abort () from /usr/lib/libc.so.6
#2  0x00007f715c05af31 in QMessageLogger::fatal(char const*, ...) const () from /usr/lib/libQt5Core.so.5
#3  0x00007f715b1989f1 in QWidgetPrivate::init(QWidget*, QFlags<Qt::WindowType>) () from /usr/lib/libQt5Widgets.so.5
#4  0x00007f715b1aed73 in QDesktopWidget::QDesktopWidget() () from /usr/lib/libQt5Widgets.so.5
#5  0x00007f715b15035d in QApplication::desktop() () from /usr/lib/libQt5Widgets.so.5
#6  0x00007f714410de72 in ?? () from /usr/lib/qt/plugins/kf5/org.kde.kwindowsystem.platforms/KF5WindowSystemX11Plugin.so
#7  0x00007f715d9f8d12 in NETRootInfo::currentDesktop(bool) const () from /usr/lib/libKF5WindowSystem.so.5
#8  0x00007f714410b87c in ?? () from /usr/lib/qt/plugins/kf5/org.kde.kwindowsystem.platforms/KF5WindowSystemX11Plugin.so
#9  0x00007f715c24a3ff in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () from /usr/lib/libQt5Core.so.5
#10 0x00007f7151934554 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () from /usr/lib/libQt5XcbQpa.so.5
#11 0x00007f7151935303 in QXcbConnection::processXcbEvents() () from /usr/lib/libQt5XcbQpa.so.5
#12 0x00007f715c27ceb1 in QObject::event(QEvent*) () from /usr/lib/libQt5Core.so.5
#13 0x00007f715c24d769 in QCoreApplication::notify(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#14 0x00007f715c24d89b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#15 0x00007f715c24fc96 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQt5Core.so.5
#16 0x00007f715c2a17c2 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#17 0x00007f715199735d in ?? () from /usr/lib/libQt5XcbQpa.so.5
#18 0x00007f715c24b26a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#19 0x00007f715c25320c in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#20 0x0000000000411ee4 in main ()

journalctl_kactivitymanagerd_crash.log

Oct 05 15:47:25 jarmano kactivitymanagerd[3122]: QWidget: Cannot create a QWidget without QApplication
Oct 05 15:47:25 jarmano systemd-coredump[3989]: Process 3122 (kactivitymanage) of user 1000 dumped core.