System Settings won't open

System Settings won't open (suddenly).
The window blinks for a semi-second and disappears.

Details:

$ uname -a
Linux roman-pc 5.0.18-1-MANJARO #1 SMP PREEMPT Wed May 22 17:35:29 UTC 2019 x86_64 GNU/Linux

$ plasmashell --version
plasmashell 5.15.5

Log (systemd-coredump):

Process 30220 (systemsettings5) of user 1000 dumped core.

Stack trace of thread 30220:
#0  0x00007f240baf082f raise (libc.so.6)
#1  0x00007f240badb672 abort (libc.so.6)
#2  0x00007f240be927fc _ZNK14QMessageLogger5fatalEPKcz (libQt5Core.so.5)
#3  0x00007f240b8bf036 n/a (libQt5QuickWidgets.so.5)
#4  0x00007f240b8bf36c n/a (libQt5QuickWidgets.so.5)
#5  0x00007f240b8c15b6 _ZN12QQuickWidget11resizeEventEP12QResizeEvent (libQt5QuickWidgets.so.5)
#6  0x00007f240cb2d50e _ZN7QWidget5eventEP6QEvent (libQt5Widgets.so.5)
#7  0x00007f240b8c229e _ZN12QQuickWidget5eventEP6QEvent (libQt5QuickWidgets.so.5)
#8  0x00007f240caebda4 _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent (libQt5Widgets.so.5)
#9  0x00007f240caf33c1 _ZN12QApplication6notifyEP7QObjectP6QEvent (libQt5Widgets.so.5)
#10 0x00007f240c087849 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt5Core.so.5)
#11 0x00007f240cb25390 _ZN14QWidgetPrivate30sendPendingMoveAndResizeEventsEbb (libQt5Widgets.so.5)
#12 0x00007f240cb29344 _ZN14QWidgetPrivate11show_helperEv (libQt5Widgets.so.5)
#13 0x00007f240cb2c645 _ZN14QWidgetPrivate10setVisibleEb (libQt5Widgets.so.5)
#14 0x00007f240cb29301 _ZN14QWidgetPrivate12showChildrenEb (libQt5Widgets.so.5)
#15 0x00007f240cb29362 _ZN14QWidgetPrivate11show_helperEv (libQt5Widgets.so.5)
#16 0x00007f240cb2c645 _ZN14QWidgetPrivate10setVisibleEb (libQt5Widgets.so.5)
#17 0x00007f240cb0fd13 _ZN14QStackedLayout15setCurrentIndexEi (libQt5Widgets.so.5)
#18 0x00007f240cb10343 _ZN14QStackedLayout12insertWidgetEiP7QWidget (libQt5Widgets.so.5)
#19 0x000055c8d2339535 n/a (systemsettings5)
#20 0x000055c8d233c1b9 n/a (systemsettings5)
#21 0x00007f240c0be327 n/a (libQt5Core.so.5)
#22 0x00007f240c0b2a3b _ZN7QObject5eventEP6QEvent (libQt5Core.so.5)
#23 0x00007f240caebda4 _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent (libQt5Widgets.so.5)
#24 0x00007f240caf33c1 _ZN12QApplication6notifyEP7QObjectP6QEvent (libQt5Widgets.so.5)
#25 0x00007f240c087849 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt5Core.so.5)
#26 0x00007f240c0dbd15 _ZN14QTimerInfoList14activateTimersEv (libQt5Core.so.5)
#27 0x00007f240c0dc5a2 n/a (libQt5Core.so.5)
#28 0x00007f240987190f g_main_context_dispatch (libglib-2.0.so.0)
#29 0x00007f2409873869 n/a (libglib-2.0.so.0)
#30 0x00007f24098738ae g_main_context_iteration (libglib-2.0.so.0)
#31 0x00007f240c0dc969 _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5)
#32 0x00007f240c0864dc _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5)
#33 0x00007f240c08e596 _ZN16QCoreApplication4execEv (libQt5Core.so.5)
#34 0x000055c8d2336464 n/a (systemsettings5)
#35 0x00007f240badcce3 __libc_start_main (libc.so.6)
#36 0x000055c8d23364ee _start (systemsettings5)

Stack trace of thread 30223:
#0  0x00007f240bba90d1 __poll (libc.so.6)
#1  0x00007f24098737c0 n/a (libglib-2.0.so.0)
#2  0x00007f24098738ae g_main_context_iteration (libglib-2.0.so.0)
#3  0x00007f240c0dc969 _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5)
#4  0x00007f240c0864dc _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5)
#5  0x00007f240becb239 _ZN7QThread4execEv (libQt5Core.so.5)
#6  0x00007f240c354ba6 n/a (libQt5DBus.so.5)
#7  0x00007f240becc63c n/a (libQt5Core.so.5)
#8  0x00007f240a5aca92 start_thread (libpthread.so.0)
#9  0x00007f240bbb3cd3 __clone (libc.so.6)

Stack trace of thread 30222:
#0  0x00007f240bba90d1 __poll (libc.so.6)
#1  0x00007f240a56d630 n/a (libxcb.so.1)
#2  0x00007f240a56f2db xcb_wait_for_event (libxcb.so.1)
#3  0x00007f24066c1b69 n/a (libQt5XcbQpa.so.5)
#4  0x00007f240becc63c n/a (libQt5Core.so.5)
#5  0x00007f240a5aca92 start_thread (libpthread.so.0)
#6  0x00007f240bbb3cd3 __clone (libc.so.6)

Stack trace of thread 30226:
#0  0x00007f240bba90d1 __poll (libc.so.6)
#1  0x00007f24098737c0 n/a (libglib-2.0.so.0)
#2  0x00007f24098738ae g_main_context_iteration (libglib-2.0.so.0)
#3  0x00007f240c0dc969 _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5)
#4  0x00007f240c0864dc _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5)
#5  0x00007f240becb239 _ZN7QThread4execEv (libQt5Core.so.5)
#6  0x00007f240b258059 n/a (libQt5Qml.so.5)
#7  0x00007f240becc63c n/a (libQt5Core.so.5)
#8  0x00007f240a5aca92 start_thread (libpthread.so.0)
#9  0x00007f240bbb3cd3 __clone (libc.so.6)

Stack trace of thread 30225:
#0  0x00007f240bba90d1 __poll (libc.so.6)
#1  0x00007f24098737c0 n/a (libglib-2.0.so.0)
#2  0x00007f24098738ae g_main_context_iteration (libglib-2.0.so.0)
#3  0x00007f240c0dc969 _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5)
#4  0x00007f240c0864dc _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5)
#5  0x00007f240becb239 _ZN7QThread4execEv (libQt5Core.so.5)
#6  0x00007f240b258059 n/a (libQt5Qml.so.5)
#7  0x00007f240becc63c n/a (libQt5Core.so.5)
#8  0x00007f240a5aca92 start_thread (libpthread.so.0)
#9  0x00007f240bbb3cd3 __clone (libc.so.6)


"Visual" log fragment:

Screenshot_20190622_150000

Open Terminal

sudo pacman-mirrors -f5 && sudo pacman -Syyu

And try kernel 5.1, 4.19 or 4.14.
Kernel 5.0 is EOL.

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