Application: plasmashell (5.12.5)

Qt Version: 5.10.1
Frameworks Version: 5.46.0
Operating System: Linux 4.16.11-300.fc28.x86_64 x86_64
Distribution: "Fedora release 28 (Twenty Eight)"

-- Information about the crash:
- What I was doing when the application crashed:
Typing "idea" to launch Jetbrains Idea from the lower left menu/launcher.
I noticed the same kind of crash also when typing other stuff. The crash does not always happen even with the same inputs.
- Unusual behavior I noticed:
The menu shows me the appropriate matches with the string given as input.

The crash can be reproduced sometimes.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
[KCrash Handler]
#6  0x00007f57e5b802bc in QMutex::lock() () at /lib64/libQt5Core.so.5
#7  0x00007f57e5b814ef in QReadWriteLockPrivate::recursiveLockForRead(int) () at /lib64/libQt5Core.so.5
#8  0x00007f57e5b81902 in QReadWriteLock::tryLockForRead(int) () at /lib64/libQt5Core.so.5
#9  0x00007f57219f2a95 in Plasma::RunnerContext::isValid() const () at /lib64/libKF5Runner.so.5
#10 0x00007f57219f531d in Plasma::RunnerContext::addMatch(Plasma::QueryMatch const&) () at /lib64/libKF5Runner.so.5
#11 0x00007f57219e818e in  () at /lib64/libKF5Runner.so.5
#12 0x00007f57e5d5fa26 in QObject::event(QEvent*) () at /lib64/libQt5Core.so.5
#13 0x00007f57e66cae95 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#14 0x00007f57e66d283a in QApplication::notify(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#15 0x00007f57e5d36376 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /lib64/libQt5Core.so.5
#16 0x00007f57e5d3909b in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /lib64/libQt5Core.so.5
#17 0x00007f57e5d86ec7 in postEventSourceDispatch(_GSource*, int (*)(void*), void*) () at /lib64/libQt5Core.so.5
#18 0x00007f57dd7698ad in g_main_context_dispatch () at /lib64/libglib-2.0.so.0
#19 0x00007f57dd769c78 in  () at /lib64/libglib-2.0.so.0
#20 0x00007f57dd769d10 in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#21 0x00007f57e5d86c13 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#22 0x00007f57cc158065 in QPAEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5XcbQpa.so.5
#23 0x00007f57e5d3512b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#24 0x00007f57e5d3d5b6 in QCoreApplication::exec() () at /lib64/libQt5Core.so.5
#25 0x0000563c9860cf38 in  ()
#26 0x00007f57e4dee18b in __libc_start_main () at /lib64/libc.so.6
#27 0x0000563c9860d2ca in _start ()

Reported using DrKonqi