SIGSEGV on Configure in Plasma 5 - Arch

[Jerdle-code]

In Arch Linux, systemsettings5 fails with a SIGSEGV upon attempting to configure QtCurve. This occurs in both the packaged version (1.9.1-1) and the git version (1.9.0.rc1.12.gb4d175d5-1).

How to reproduce:
Install qtcurve and Plasma 5 in Arch Linux.
Run System Settings > Application Style > Widget Style
Select QtCurve
Press Configure

Expected behaviour:
Configuration window displayed.

Actual behaviour:
Segfault.

Backtrace

Application: System Settings (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f280d5f16c0 (LWP 17745))]

Thread 3 (Thread 0x7f27ee49a700 (LWP 17883)):
#0  0x00007f2809237e9d in poll () from /usr/lib/libc.so.6
#1  0x00007f2803088c09 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007f2803088d1c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007f2809b6c084 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#4  0x00007f2809b0fffb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#5  0x00007f280992940e in QThread::exec() () from /usr/lib/libQt5Core.so.5
#6  0x00007f280a48b396 in ?? () from /usr/lib/libQt5DBus.so.5
#7  0x00007f280992e15b in ?? () from /usr/lib/libQt5Core.so.5
#8  0x00007f2805268049 in start_thread () from /usr/lib/libpthread.so.0
#9  0x00007f2809241f0f in clone () from /usr/lib/libc.so.6

Thread 2 (Thread 0x7f27fa7e1700 (LWP 17806)):
#0  0x00007f2809237e9d in poll () from /usr/lib/libc.so.6
#1  0x00007f2805aec8e0 in ?? () from /usr/lib/libxcb.so.1
#2  0x00007f2805aee679 in xcb_wait_for_event () from /usr/lib/libxcb.so.1
#3  0x00007f27fd37c72a in ?? () from /usr/lib/libQt5XcbQpa.so.5
#4  0x00007f280992e15b in ?? () from /usr/lib/libQt5Core.so.5
#5  0x00007f2805268049 in start_thread () from /usr/lib/libpthread.so.0
#6  0x00007f2809241f0f in clone () from /usr/lib/libc.so.6

Thread 1 (Thread 0x7f280d5f16c0 (LWP 17745)):
[KCrash Handler]
#5  0x00007f280af24495 in QWindow::winId() const () from /usr/lib/libQt5Gui.so.5
#6  0x00007f27f93515c3 in ?? () from /usr/lib/qt/plugins/platformthemes/KDEPlasmaPlatformTheme.so
#7  0x00007f27f9351cad in ?? () from /usr/lib/qt/plugins/platformthemes/KDEPlasmaPlatformTheme.so
#8  0x00007f280b84ba1d in ?? () from /usr/lib/libQt5Widgets.so.5
#9  0x00007f280b84c5d8 in QMenuBar::eventFilter(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#10 0x00007f2809b1189c in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#11 0x00007f280b6dee28 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#12 0x00007f280b6e6926 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#13 0x00007f2809b11bd0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#14 0x00007f280b722182 in QWidget::setParent(QWidget*, QFlags<Qt::WindowType>) () from /usr/lib/libQt5Widgets.so.5
#15 0x00007f280b6fc26f in QLayout::addChildWidget(QWidget*) () from /usr/lib/libQt5Widgets.so.5
#16 0x00007f280b6fc320 in QLayout::addWidget(QWidget*) () from /usr/lib/libQt5Widgets.so.5
#17 0x00007f280b8304ff in QMdiSubWindow::setWidget(QWidget*) () from /usr/lib/libQt5Widgets.so.5
#18 0x00007f280b823e18 in QMdiArea::addSubWindow(QWidget*, QFlags<Qt::WindowType>) () from /usr/lib/libQt5Widgets.so.5
#19 0x00007f27e41f1550 in ?? () from /usr/lib/qt/plugins/kstyle_qtcurve5_config.so
#20 0x00007f27e41ff3c9 in ?? () from /usr/lib/qt/plugins/kstyle_qtcurve5_config.so
#21 0x00007f27e41ff472 in allocate_kstyle_config () from /usr/lib/qt/plugins/kstyle_qtcurve5_config.so
#22 0x00007f27e447a942 in ?? () from /usr/lib/qt/plugins/kcm_style.so
#23 0x00007f2809b418af in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQt5Core.so.5
#24 0x00007f280b8a42f3 in QAbstractButton::clicked(bool) () from /usr/lib/libQt5Widgets.so.5
#25 0x00007f280b8a450c in ?? () from /usr/lib/libQt5Widgets.so.5
#26 0x00007f280b8a594c in ?? () from /usr/lib/libQt5Widgets.so.5
#27 0x00007f280b8a5b45 in QAbstractButton::mouseReleaseEvent(QMouseEvent*) () from /usr/lib/libQt5Widgets.so.5
#28 0x00007f280b720d68 in QWidget::event(QEvent*) () from /usr/lib/libQt5Widgets.so.5
#29 0x00007f280b6dee4c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#30 0x00007f280b6e6ea1 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#31 0x00007f2809b11bd0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#32 0x00007f280b6e5e2a in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () from /usr/lib/libQt5Widgets.so.5
#33 0x00007f280b73bf51 in ?? () from /usr/lib/libQt5Widgets.so.5
#34 0x00007f280b73e691 in ?? () from /usr/lib/libQt5Widgets.so.5
#35 0x00007f280b6dee4c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#36 0x00007f280b6e6926 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#37 0x00007f2809b11bd0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#38 0x00007f280af1a1e4 in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () from /usr/lib/libQt5Gui.so.5
#39 0x00007f280af1bd46 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () from /usr/lib/libQt5Gui.so.5
#40 0x00007f280aef34ac in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Gui.so.5
#41 0x00007f27fd3e0cc1 in ?? () from /usr/lib/libQt5XcbQpa.so.5
#42 0x00007f2803088a57 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#43 0x00007f2803088c88 in ?? () from /usr/lib/libglib-2.0.so.0
#44 0x00007f2803088d1c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#45 0x00007f2809b6c061 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#46 0x00007f2809b0fffb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#47 0x00007f2809b19048 in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#48 0x000000e573ed3c84 in ?? ()
#49 0x00007f28091744ca in __libc_start_main () from /usr/lib/libc.so.6
#50 0x000000e573ed3d0a in _start ()