When I start and quit Krita I get Segmentation fault.

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Application: krita (krita), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f8d96042800 (LWP 27955))]

Thread 3 (Thread 0x7f8d58fd7700 (LWP 27962)):
#0  0x00007f8d8cf3e3bd in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f8d9309e5bd in __gthread_cond_wait (__mutex=<optimized out>, __cond=<optimized out>) at /build/gcc/src/gcc-build/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/gthr-default.h:864
#2  0x00007f8d9309e5bd in std::condition_variable::wait(std::unique_lock<std::mutex>&) (this=<optimized out>, __lock=...) at /build/gcc/src/gcc/libstdc++-v3/src/c++11/condition_variable.cc:53
#3  0x00007f8d45f90d09 in  () at /usr/lib/libQt5WebKit.so.5
#4  0x00007f8d45f90e59 in  () at /usr/lib/libQt5WebKit.so.5
#5  0x00007f8d930a4b9f in std::execute_native_thread_routine(void*) (__p=0x56094507ca00) at /build/gcc/src/gcc/libstdc++-v3/src/c++11/thread.cc:83
#6  0x00007f8d8cf3808c in start_thread () at /usr/lib/libpthread.so.0
#7  0x00007f8d92b12e7f in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f8d6ce89700 (LWP 27958)):
#0  0x00007f8d92b0897b in poll () at /usr/lib/libc.so.6
#1  0x00007f8d8b3a4ff3 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f8d8b3a510e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f8d9366b314 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f8d9360d3db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f8d9341c7ae in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f8d8d163416 in  () at /usr/lib/libQt5DBus.so.5
#7  0x00007f8d93421b4d in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f8d8cf3808c in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f8d92b12e7f in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f8d96042800 (LWP 27955)):
[KCrash Handler]
#6  0x00007f8d8cf40e39 in sem_wait@@GLIBC_2.2.5 () at /usr/lib/libpthread.so.0
#7  0x00007f8d54f8ff26 in PyThread_acquire_lock_timed () at /usr/lib/libpython3.6m.so.1.0
#8  0x00007f8d550860cd in  () at /usr/lib/libpython3.6m.so.1.0
#9  0x00007f8d54f1cd56 in  () at /usr/lib/libpython3.6m.so.1.0
#10 0x00007f8d544bf345 in  () at /usr/lib/python3.6/site-packages/sip.so
#11 0x00007f8d5421eef7 in sipDockWidgetFactoryBase::~sipDockWidgetFactoryBase() () at /usr/lib/krita-python-libs/PyKrita/krita.so
#12 0x00007f8d5421ef1a in sipDockWidgetFactoryBase::~sipDockWidgetFactoryBase() () at /usr/lib/krita-python-libs/PyKrita/krita.so
#13 0x00007f8d8fd9a7ae in KoDockRegistry::~KoDockRegistry() () at /usr/lib/libkritaflake.so.16
#14 0x00007f8d8fd9a8ca in  () at /usr/lib/libkritaflake.so.16
#15 0x00007f8d92a54448 in __run_exit_handlers () at /usr/lib/libc.so.6
#16 0x00007f8d92a5449a in  () at /usr/lib/libc.so.6
#17 0x00007f8d92a3df51 in __libc_start_main () at /usr/lib/libc.so.6
#18 0x0000560939cf709a in _start ()