Application: systemsettings5 (5.3.0)

Qt Version: 5.4.1
Operating System: Linux 4.0.1-1-ARCH x86_64
Distribution (Platform): Archlinux Packages

-- Information about the crash:
- What I was doing when the application crashed:
I removed my account picture and clicked apply, when the systemsettings crashed. Sometimes before the crash a popup saying "Could not delete file /home/$USER/.face.icon." appears, when I click OK, systemsetting crash, sometimes they crash without popup. 
It crashed 5 out of 6 times.

- Unusual behavior I noticed:
None.
- Custom settings of the application:
None.

The crash can be reproduced sometimes.

-- Backtrace:
Application: System Settings (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f32d573a7c0 (LWP 6323))]

Thread 2 (Thread 0x7f32d39d9700 (LWP 6324)):
#0  0x00007f32e1e9c4ed in poll () from /usr/lib/libc.so.6
#1  0x00007f32df9249f2 in ?? () from /usr/lib/libxcb.so.1
#2  0x00007f32df92656f in xcb_wait_for_event () from /usr/lib/libxcb.so.1
#3  0x00007f32d5507399 in ?? () from /usr/lib/qt/plugins/platforms/libqxcb.so
#4  0x00007f32e25125de in ?? () from /usr/lib/libQt5Core.so.5
#5  0x00007f32df09d374 in start_thread () from /usr/lib/libpthread.so.0
#6  0x00007f32e1ea527d in clone () from /usr/lib/libc.so.6

Thread 1 (Thread 0x7f32d573a7c0 (LWP 6323)):
[KCrash Handler]
#5  0x00007f32e3bec6f7 in QWidgetPrivate::init(QWidget*, QFlags<Qt::WindowType>) () from /usr/lib/libQt5Widgets.so.5
#6  0x00007f32e3da58c5 in QDialog::QDialog(QWidget*, QFlags<Qt::WindowType>) () from /usr/lib/libQt5Widgets.so.5
#7  0x00007f32e41b31c6 in KMessageBox::messageBox(QWidget*, KMessageBox::DialogType, QString const&, QString const&, KGuiItem const&, KGuiItem const&, KGuiItem const&, QString const&, QFlags<KMessageBox::Option>) () from /usr/lib/libKF5WidgetsAddons.so.5
#8  0x00007f32dc75a04e in KDialogJobUiDelegate::Private::next() () from /usr/lib/libKF5JobWidgets.so.5
#9  0x00007f32e272f1da in QObject::event(QEvent*) () from /usr/lib/libQt5Core.so.5
#10 0x00007f32e3ba7acc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#11 0x00007f32e3bacf10 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#12 0x00007f32e26fde6b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#13 0x00007f32e26ffeab in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQt5Core.so.5
#14 0x00007f32e2755e73 in ?? () from /usr/lib/libQt5Core.so.5
#15 0x00007f32deb809fd in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#16 0x00007f32deb80ce0 in ?? () from /usr/lib/libglib-2.0.so.0
#17 0x00007f32deb80d8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#18 0x00007f32e2756267 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#19 0x00007f32e26fb902 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#20 0x00007f32e27032dc in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#21 0x000000000040eeab in main ()

Reported using DrKonqi