Application: umbrello5 (2.23.0)

Qt Version: 5.9.1
Frameworks Version: 5.37.0
Operating System: Linux 4.12.8-2-ARCH x86_64
Distribution: "Arch Linux"

-- Information about the crash:
- What I was doing when the application crashed:
Double clieck and press delete button for two Directional Assotiation line one by one. After second line was deleted (but without arrow, it stay on the place) tryied to select the arrow by double click and the app has crashed.

-- Backtrace:
Application: Umbrello UML Modeller (umbrello5), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fdb4862f880 (LWP 28366))]

Thread 4 (Thread 0x7fdb226e7700 (LWP 28370)):
#0  0x00007fdb42b87c6b in poll () at /usr/lib/libc.so.6
#1  0x00007fdb39b20c09 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007fdb39b20d1c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007fdb43810084 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007fdb437b3ffb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007fdb435cd40e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007fdb3cc0c396 in  () at /usr/lib/libQt5DBus.so.5
#7  0x00007fdb435d215b in  () at /usr/lib/libQt5Core.so.5
#8  0x00007fdb3c0f108a in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007fdb42b921cf in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7fdb2b0ce700 (LWP 28369)):
#0  0x00007fdb42b87c6b in poll () at /usr/lib/libc.so.6
#1  0x00007fdb398b98e0 in  () at /usr/lib/libxcb.so.1
#2  0x00007fdb398bb679 in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007fdb2da6472a in  () at /usr/lib/libQt5XcbQpa.so.5
#4  0x00007fdb435d215b in  () at /usr/lib/libQt5Core.so.5
#5  0x00007fdb3c0f108a in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007fdb42b921cf in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7fdb2ed94700 (LWP 28368)):
#0  0x00007fdb3c0f738d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007fdb4325248d in __gthread_cond_wait (__mutex=<optimized out>, __cond=<optimized out>) at /build/gcc-multilib/src/gcc-build/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/gthr-default.h:864
#2  0x00007fdb4325248d in std::condition_variable::wait(std::unique_lock<std::mutex>&) (this=<optimized out>, __lock=...) at /build/gcc-multilib/src/gcc/libstdc++-v3/src/c++11/condition_variable.cc:53
#3  0x00007fdb418163f7 in  () at /usr/lib/libQt5WebKit.so.5
#4  0x00007fdb41816539 in  () at /usr/lib/libQt5WebKit.so.5
#5  0x00007fdb43258a6f in std::execute_native_thread_routine(void*) (__p=0x556ac9e27da0) at /build/gcc-multilib/src/gcc/libstdc++-v3/src/c++11/thread.cc:83
#6  0x00007fdb3c0f108a in start_thread () at /usr/lib/libpthread.so.0
#7  0x00007fdb42b921cf in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7fdb4862f880 (LWP 28366)):
[KCrash Handler]
#5  0x00007fdb44a9bb2b in  () at /usr/lib/libQt5Widgets.so.5
#6  0x00007fdb44a9ab9a in  () at /usr/lib/libQt5Widgets.so.5
#7  0x00007fdb44a9ab46 in  () at /usr/lib/libQt5Widgets.so.5
#8  0x00007fdb44a9ac23 in  () at /usr/lib/libQt5Widgets.so.5
#9  0x00007fdb44a9df76 in  () at /usr/lib/libQt5Widgets.so.5
#10 0x00007fdb44a9e257 in  () at /usr/lib/libQt5Widgets.so.5
#11 0x00007fdb44aa2905 in  () at /usr/lib/libQt5Widgets.so.5
#12 0x00007fdb44a7dee9 in QGraphicsScene::items(QPointF const&, Qt::ItemSelectionMode, Qt::SortOrder, QTransform const&) const () at /usr/lib/libQt5Widgets.so.5
#13 0x0000556ac7f92030 in  ()
#14 0x0000556ac82e278c in  ()
#15 0x0000556ac82e19b0 in  ()
#16 0x0000556ac7f94ecd in  ()
#17 0x00007fdb44a92ac0 in QGraphicsScene::event(QEvent*) () at /usr/lib/libQt5Widgets.so.5
#18 0x00007fdb44775e4c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#19 0x00007fdb4477d926 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#20 0x00007fdb437b5bd0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#21 0x00007fdb44aaff4d in QGraphicsView::mousePressEvent(QMouseEvent*) () at /usr/lib/libQt5Widgets.so.5
#22 0x0000556ac7fa6c8b in  ()
#23 0x00007fdb447b86ef in QWidget::event(QEvent*) () at /usr/lib/libQt5Widgets.so.5
#24 0x00007fdb4489b60f in QFrame::event(QEvent*) () at /usr/lib/libQt5Widgets.so.5
#25 0x00007fdb44ab12ac in QGraphicsView::viewportEvent(QEvent*) () at /usr/lib/libQt5Widgets.so.5
#26 0x00007fdb437b589c in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#27 0x00007fdb44775e28 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#28 0x00007fdb4477dea1 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#29 0x00007fdb437b5bd0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#30 0x00007fdb4477ce2a in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () at /usr/lib/libQt5Widgets.so.5
#31 0x00007fdb447d2f51 in  () at /usr/lib/libQt5Widgets.so.5
#32 0x00007fdb447d5691 in  () at /usr/lib/libQt5Widgets.so.5
#33 0x00007fdb44775e4c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#34 0x00007fdb4477d926 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#35 0x00007fdb437b5bd0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#36 0x00007fdb43fb11e4 in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () at /usr/lib/libQt5Gui.so.5
#37 0x00007fdb43fb2d46 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () at /usr/lib/libQt5Gui.so.5
#38 0x00007fdb43f8a4ac in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Gui.so.5
#39 0x00007fdb2dac8cc1 in  () at /usr/lib/libQt5XcbQpa.so.5
#40 0x00007fdb39b20a57 in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#41 0x00007fdb39b20c88 in  () at /usr/lib/libglib-2.0.so.0
#42 0x00007fdb39b20d1c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#43 0x00007fdb43810061 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#44 0x00007fdb437b3ffb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#45 0x00007fdb437bd048 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#46 0x0000556ac7f2ce36 in  ()
#47 0x00007fdb42abcf6a in __libc_start_main () at /usr/lib/libc.so.6
#48 0x0000556ac7f479da in _start ()

Reported using DrKonqi