Application: systemsettings5 (5.4.3)

Qt Version: 5.5.1
Operating System: Linux 4.3.0-1-lqx x86_64
Distribution (Platform): Archlinux Packages

-- Information about the crash:
- What I was doing when the application crashed:
I had just logged in to KDE5 on Archlinux. I opened systemsettings & switched the application style from 'Oxygen' to 'Fusion'. I then clicked the quit button in systemsettings. The kcrash dialog appeared.

-- Backtrace:
Application: System Settings (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f7b489a7800 (LWP 3304))]

Thread 4 (Thread 0x7f7b35130700 (LWP 3305)):
#0  0x00007f7b4467a18d in poll () from /usr/lib/libc.so.6
#1  0x00007f7b4140bae2 in ?? () from /usr/lib/libxcb.so.1
#2  0x00007f7b4140d757 in xcb_wait_for_event () from /usr/lib/libxcb.so.1
#3  0x00007f7b36a60e89 in ?? () from /usr/lib/libQt5XcbQpa.so.5
#4  0x00007f7b44d7b96e in ?? () from /usr/lib/libQt5Core.so.5
#5  0x00007f7b40b8a4a4 in start_thread () from /usr/lib/libpthread.so.0
#6  0x00007f7b4468313d in clone () from /usr/lib/libc.so.6

Thread 3 (Thread 0x7f7b23c3e700 (LWP 3306)):
#0  0x00007f7b40b9007f in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
#1  0x00007f7b276562ea in ?? () from /usr/lib/xorg/modules/dri/r600_dri.so
#2  0x00007f7b27655a27 in ?? () from /usr/lib/xorg/modules/dri/r600_dri.so
#3  0x00007f7b40b8a4a4 in start_thread () from /usr/lib/libpthread.so.0
#4  0x00007f7b4468313d in clone () from /usr/lib/libc.so.6

Thread 2 (Thread 0x7f7b1e6d7700 (LWP 3314)):
#0  0x00007f7b4467a18d in poll () from /usr/lib/libc.so.6
#1  0x00007f7b4066cfbc in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007f7b4066d0cc in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007f7b44fb334f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#4  0x00007f7b44f5a37a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#5  0x00007f7b44d769c4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#6  0x00007f7b432c4c85 in ?? () from /usr/lib/libQt5Qml.so.5
#7  0x00007f7b44d7b96e in ?? () from /usr/lib/libQt5Core.so.5
#8  0x00007f7b40b8a4a4 in start_thread () from /usr/lib/libpthread.so.0
#9  0x00007f7b4468313d in clone () from /usr/lib/libc.so.6

Thread 1 (Thread 0x7f7b489a7800 (LWP 3304)):
[KCrash Handler]
#5  0x0000000000000040 in ?? ()
#6  0x00007f7b44f8f6f9 in QObject::disconnect(QObject const*, char const*, QObject const*, char const*) () from /usr/lib/libQt5Core.so.5
#7  0x00007f7b21dbf989 in KParts::PartManager::~PartManager() () from /usr/lib/libKF5Parts.so.5
#8  0x00007f7b21dbfc49 in KParts::PartManager::~PartManager() () from /usr/lib/libKF5Parts.so.5
#9  0x00007f7b44f8965b in QObjectPrivate::deleteChildren() () from /usr/lib/libQt5Core.so.5
#10 0x00007f7b44f933e0 in QObject::~QObject() () from /usr/lib/libQt5Core.so.5
#11 0x00007f7b2251555b in KHTMLPart::~KHTMLPart() () from /usr/lib/libKF5KHtml.so.5
#12 0x00007f7b22515679 in KHTMLPart::~KHTMLPart() () from /usr/lib/libKF5KHtml.so.5
#13 0x00007f7b44f8c010 in QObject::event(QEvent*) () from /usr/lib/libQt5Core.so.5
#14 0x00007f7b46b0701c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#15 0x00007f7b46b0c4f6 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#16 0x00007f7b44f5c9ab in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#17 0x00007f7b44f5eda6 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQt5Core.so.5
#18 0x00007f7b44fb2f43 in ?? () from /usr/lib/libQt5Core.so.5
#19 0x00007f7b4066cdc7 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#20 0x00007f7b4066d020 in ?? () from /usr/lib/libglib-2.0.so.0
#21 0x00007f7b4066d0cc in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#22 0x00007f7b44fb334f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#23 0x00007f7b44f5a37a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#24 0x00007f7b44f6233c in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#25 0x000000000040eeab in main ()

Reported using DrKonqi