SUMMARY
plasmasystemmonitor crash when closed and net speed in chronology not working 

STEPS TO REPRODUCE
1. open plasma-systemmonitor
2. go to chronology tabs
3. observe net speed in chronology not working 
4. sometimes plasma-systemmonitor crash when closed

backtrace:
Application: Monitor di sistema (plasma-systemmonitor), signal: Segmentation fault

[KCrash Handler]
#4  0x00000000000000b0 in ?? ()
#5  0x00007f3d640a8217 in ?? () from /usr/lib/qt/qml/org/kde/kirigami.2/libkirigamiplugin.so
#6  0x00007f3d742b03bb in ?? () from /usr/lib/libQt5Core.so.5
#7  0x00007f3d738a661e in QQuickItemPrivate::setEffectiveVisibleRecur(bool) () from /usr/lib/libQt5Quick.so.5
#8  0x00007f3d738af30d in QQuickItem::setParentItem(QQuickItem*) () from /usr/lib/libQt5Quick.so.5
#9  0x00007f3d738af837 in QQuickItem::~QQuickItem() () from /usr/lib/libQt5Quick.so.5
#10 0x00007f3d58bee8e0 in ?? () from /usr/lib/qt/qml/QtQuick/Templates.2/libqtquicktemplates2plugin.so
#11 0x00007f3d640a6ecc in ?? () from /usr/lib/qt/qml/org/kde/kirigami.2/libkirigamiplugin.so
#12 0x00007f3d640a6ee9 in ?? () from /usr/lib/qt/qml/org/kde/kirigami.2/libkirigamiplugin.so
#13 0x00007f3d640a689f in ?? () from /usr/lib/qt/qml/org/kde/kirigami.2/libkirigamiplugin.so
#14 0x00007f3d640a5b43 in ?? () from /usr/lib/qt/qml/org/kde/kirigami.2/libkirigamiplugin.so
#15 0x00007f3d742b03bb in ?? () from /usr/lib/libQt5Core.so.5
#16 0x00007f3d742a97e0 in QObject::destroyed(QObject*) () from /usr/lib/libQt5Core.so.5
#17 0x00007f3d742ae6f7 in QObject::~QObject() () from /usr/lib/libQt5Core.so.5
#18 0x00007f3d58bed72d in ?? () from /usr/lib/qt/qml/QtQuick/Templates.2/libqtquicktemplates2plugin.so
#19 0x00007f3d742a37de in QObjectPrivate::deleteChildren() () from /usr/lib/libQt5Core.so.5
#20 0x00007f3d742ae575 in QObject::~QObject() () from /usr/lib/libQt5Core.so.5
#21 0x00007f3d58542827 in ?? () from /usr/lib/qt/qml/org/kde/ksysguard/faces/libFacesPlugin.so
#22 0x00007f3d742a37de in QObjectPrivate::deleteChildren() () from /usr/lib/libQt5Core.so.5
#23 0x00007f3d742ae575 in QObject::~QObject() () from /usr/lib/libQt5Core.so.5
#24 0x00007f3d590615ba in KSysGuard::SensorFaceController::~SensorFaceController() () from /usr/lib/libKSysGuardSensorFaces.so.1
#25 0x00007f3d742a37de in QObjectPrivate::deleteChildren() () from /usr/lib/libQt5Core.so.5
#26 0x00007f3d742ae575 in QObject::~QObject() () from /usr/lib/libQt5Core.so.5
#27 0x000055cf94f582e8 in ?? ()
#28 0x00007f3d73c05b25 in __libc_start_main () from /usr/lib/libc.so.6
#29 0x000055cf94f5889e in ?? ()
[Inferior 1 (process 3888) detached]

OBSERVED RESULT
plasmasystemmonitor sometimes crash when closed and net speed in chronology not working 

EXPECTED RESULT
plasmasystemmonitor show net speed and not crash

Operating System: Arch Linux
KDE Plasma Version: 5.22.0
KDE Frameworks Version: 5.82.0
Qt Version: 5.15.2
Kernel Version: 5.12.9-arch1-1 (64-bit)
Graphics Platform: X11
Processors: 4 × Intel® Celeron® CPU N3450 @ 1.10GHz
Memory: 5.7 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 500