Application: plasma-discover (5.12.90)

Qt Version: 5.10.0
Frameworks Version: 5.47.0
Operating System: Linux 4.13.0-41-generic x86_64
Distribution: KDE neon Developer Edition

-- Information about the crash:
- What I was doing when the application crashed:
Discover crashes everytime i try to start it
QmlApplicationEngine failed to load component
qrc:/qml/DiscoverWindow.qml:162 Cannot assign to non-existent property "showCloseButton"

Errors when loading the GUI
invalid kns backend! "/etc/xdg/servicemenu.knsrc" because: "Config group not found! Check your KNS3 installation."
invalid kns backend! "/etc/xdg/ksysguard.knsrc" because: "Config group not found! Check your KNS3 installation."
Discarding invalid backend "servicemenu.knsrc"
Discarding invalid backend "ksysguard.knsrc"
setting currentApplicationBackend PackageKitBackend(0x20a2370)

The crash can be reproduced every time.

-- Backtrace:
Application: Discover (plasma-discover), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f24e56408c0 (LWP 1257))]

Thread 3 (Thread 0x7f24c3fff700 (LWP 1263)):
#0  0x00007f24e095474d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f24db30f38c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f24db30f49c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f24e15905cb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f24e153764a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f24e1357554 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f24e1f32a35 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f24e135c6eb in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f24dd4066ba in start_thread (arg=0x7f24c3fff700) at pthread_create.c:333
#9  0x00007f24e096041d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f24c95ed700 (LWP 1262)):
#0  0x00007f24e095027d in read () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f24db3526f0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f24db30ee74 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f24db30f330 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f24db30f49c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f24e15905cb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f24e153764a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f24e1357554 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f24e32582c5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#9  0x00007f24e135c6eb in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007f24dd4066ba in start_thread (arg=0x7f24c95ed700) at pthread_create.c:333
#11 0x00007f24e096041d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f24e56408c0 (LWP 1257)):
[KCrash Handler]
#6  DiscoverObject::modes (this=this@entry=0x24a0c60) at /workspace/build/discover/DiscoverObject.cpp:152
#7  0x0000000000416a3a in DiscoverObject::openMode (this=this@entry=0x24a0c60, _mode=...) at /workspace/build/discover/DiscoverObject.cpp:164
#8  0x0000000000414784 in processArgs (parser=0x244ef70, mainWindow=mainWindow@entry=0x24a0c60) at /workspace/build/discover/main.cpp:72
#9  0x0000000000412c4c in main (argc=3, argv=<optimized out>) at /workspace/build/discover/main.cpp:138

Possible duplicates by query: bug 390066.

Reported using DrKonqi