Application: kontact (5.8.2)

Qt Version: 5.11.1
Frameworks Version: 5.48.0
Operating System: Linux 4.15.0-29-generic x86_64
Distribution: KDE neon User Edition 5.13

-- Information about the crash:
- What I was doing when the application crashed:

I just tried to start Kontact, nothing else.
Starting KMail, KOrganizer or Akgregator has the same result.
These errors have occured since the last update.

The crash can be reproduced every time.

-- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f655937c900 (LWP 2190))]

Thread 2 (Thread 0x7f6529b25700 (LWP 2193)):
#0  __libc_enable_asynccancel () at ../sysdeps/unix/sysv/linux/x86_64/cancellation.S:65
#1  0x00007f6555d57742 in poll () at ../sysdeps/unix/syscall-template.S:84
#2  0x00007f654fb8938c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f654fb8949c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f65568850bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f655682c5ba in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f65566615e4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f6554fcaf35 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#8  0x00007f655666c727 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f6551ab26ba in start_thread (arg=0x7f6529b25700) at pthread_create.c:333
#10 0x00007f6555d6341d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f655937c900 (LWP 2190)):
[KCrash Handler]
#6  0x00007f6558e05c20 in KontactInterface::PimUniqueApplication::staticMetaObject () from /usr/lib/x86_64-linux-gnu/libKF5KontactInterface.so.5
#7  0x00007f6558c00d3d in KontactInterface::PimUniqueApplication::start (arguments=..., unique=unique@entry=true) at /workspace/build/src/pimuniqueapplication.cpp:135
#8  0x000000000040437b in main (argc=1, argv=0x7ffc16c6b978) at /workspace/build/src/main.cpp:216

Reported using DrKonqi