Segfault in Graph View in GUI

[cebe]

After making changes to inputs on the left side, hovering the graph cause the following segfault:

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff716186f in QStandardItemModel::indexFromItem(QStandardItem const*) const () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
(gdb) bt
#0  0x00007ffff716186f in QStandardItemModel::indexFromItem(QStandardItem const*) const () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#1  0x00007ffff7162c3b in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#2  0x00007ffff7163c3a in QStandardItem::removeRows(int, int) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#3  0x00000000004b558e in uipf::MainWindow::refreshInputs() ()
#4  0x00000000004b7770 in uipf::MainWindow::on_stepSelectionChanged(QItemSelection const&) ()
#5  0x00000000004f1c68 in uipf::MainWindow::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) ()
#6  0x00007ffff7750fdd in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007ffff76d0287 in QItemSelectionModel::selectionChanged(QItemSelection const&, QItemSelection const&) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007ffff76d7ad9 in QItemSelectionModel::emitSelectionChanged(QItemSelection const&, QItemSelection const&) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007ffff76d8655 in QItemSelectionModel::select(QItemSelection const&, QFlags<QItemSelectionModel::SelectionFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007ffff76d268c in QItemSelectionModel::select(QModelIndex const&, QFlags<QItemSelectionModel::SelectionFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007ffff76d065b in QItemSelectionModel::setCurrentIndex(QModelIndex const&, QFlags<QItemSelectionModel::SelectionFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007ffff6843593 in QAbstractItemView::setCurrentIndex(QModelIndex const&) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#13 0x00000000004b753e in uipf::MainWindow::on_graphNodeSelected(uipf::gui::Node const*) ()
#14 0x00000000004f1ee1 in uipf::MainWindow::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) ()
#15 0x00007ffff7750fdd in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#16 0x00000000004f23d1 in uipf::gui::GraphWidget::nodeSelected(uipf::gui::Node const*) ()
#17 0x00000000004d40e3 in uipf::gui::GraphWidget::triggerNodeSelected(uipf::gui::Node const*) ()
#18 0x00000000004d29de in uipf::gui::Node::hoverEnterEvent(QGraphicsSceneHoverEvent*) ()
#19 0x00007ffff68e7548 in QGraphicsItem::sceneEvent(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#20 0x00007ffff68e76d5 in QGraphicsTextItem::sceneEvent(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#21 0x00007ffff6917ca0 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#22 0x00007ffff691809b in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#23 0x00007ffff6918593 in QGraphicsScene::mouseMoveEvent(QGraphicsSceneMouseEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#24 0x00007ffff692587c in QGraphicsScene::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#25 0x00007ffff65fc12c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#26 0x00007ffff6601600 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#27 0x00007ffff7721dcb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#28 0x00007ffff693f58f in QGraphicsViewPrivate::mouseMoveEventHandler(QMouseEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#29 0x00007ffff663a778 in QWidget::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#30 0x00007ffff673dd4e in QFrame::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#31 0x00007ffff69422bb in QGraphicsView::viewportEvent(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#32 0x00007ffff7721bba in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#33 0x00007ffff65fc10c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#34 0x00007ffff6601c0c in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#35 0x00007ffff7721dcb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#36 0x00007ffff660039a in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#37 0x00007ffff66595b7 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#38 0x00007ffff665b9c3 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#39 0x00007ffff65fc12c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#40 0x00007ffff6601600 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#41 0x00007ffff7721dcb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#42 0x00007ffff6df6df3 in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#43 0x00007ffff6df8665 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#44 0x00007ffff6ddd64f in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#45 0x00007fffedb91450 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so
#46 0x00007ffff21dac5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#47 0x00007ffff21daf48 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#48 0x00007ffff21daffc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#49 0x00007ffff777a1b7 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#50 0x00007ffff771f512 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#51 0x00007ffff772715c in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#52 0x00000000004b2f4c in main ()