Crash in ProjectExplorer::Internal::FlatModel::flags

 ~ % gdb -c ./core /d1/creator/ut/4.9/release/bin/qtcreator
Reading symbols from /d1/creator/ut/4.9/release/bin/qtcreator...Reading symbols from /d1/creator/ut/4.9/release/bin/qtcreator.debug...done.
done.
[New LWP 2043]
[New LWP 2182]
[New LWP 2045]
[New LWP 2054]
[New LWP 2046]
[New LWP 2048]
[New LWP 2138]
[New LWP 2137]
[New LWP 2052]
[New LWP 2047]
[New LWP 2053]
[New LWP 2049]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
btCore was generated by `/d1/creator/ut/4.9/release/bin/qtcreator clang-trunk'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f926e3bf49e in ProjectExplorer::Internal::FlatModel::flags (this=<optimized out>, index=...)
    at projectmodels.cpp:187
187	        if (!node->asProjectNode()) {
[Current thread is 1 (Thread 0x7f928d0414c0 (LWP 2043))]
(gdb) bt
#0  0x00007f926e3bf49e in ProjectExplorer::Internal::FlatModel::flags(QModelIndex const&) const (this=<optimized out>, index=...) at projectmodels.cpp:187
#1  0x00007f928c3aa017 in QTreeViewPrivate::layout(int, bool, bool) ()
    at /home/nik/opt/qt-5.12.0/5.12.0/gcc_64/lib/libQt5Widgets.so.5
#2  0x00007f928c3aa2d7 in QTreeViewPrivate::layout(int, bool, bool) ()
    at /home/nik/opt/qt-5.12.0/5.12.0/gcc_64/lib/libQt5Widgets.so.5
#3  0x00007f928c3b1bb6 in QTreeView::doItemsLayout() ()
    at /home/nik/opt/qt-5.12.0/5.12.0/gcc_64/lib/libQt5Widgets.so.5
#4  0x00007f928c3ab825 in QTreeView::sizeHintForColumn(int) const ()
    at /home/nik/opt/qt-5.12.0/5.12.0/gcc_64/lib/libQt5Widgets.so.5
#5  0x00007f926e39e089 in ProjectTreeView::sizeHintForColumn(int) const (this=0x55dac96535e0, column=<optimized out>)
    at projecttreewidget.cpp:214
#6  0x00007f928c354d47 in QHeaderViewPrivate::resizeSections(QHeaderView::ResizeMode, bool) ()
    at /home/nik/opt/qt-5.12.0/5.12.0/gcc_64/lib/libQt5Widgets.so.5
#7  0x00007f928c35a3a8 in QHeaderView::event(QEvent*) ()
    at /home/nik/opt/qt-5.12.0/5.12.0/gcc_64/lib/libQt5Widgets.so.5
#8  0x00007f928c10d85c in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
    at /home/nik/opt/qt-5.12.0/5.12.0/gcc_64/lib/libQt5Widgets.so.5
#9  0x00007f928c1149f0 in QApplication::notify(QObject*, QEvent*) ()
    at /home/nik/opt/qt-5.12.0/5.12.0/gcc_64/lib/libQt5Widgets.so.5
#10 0x00007f928aec3c18 in QCoreApplication::notifyInternal2(QObject*, QEvent*) ()
    at /home/nik/opt/qt-5.12.0/5.12.0/gcc_64/lib/libQt5Core.so.5
#11 0x00007f928af1a289 in QTimerInfoList::activateTimers() ()
    at /home/nik/opt/qt-5.12.0/5.12.0/gcc_64/lib/libQt5Core.so.5
#12 0x00007f928af1aa99 in idleTimerSourceDispatch(_GSource*, int (*)(void*), void*) ()
    at /home/nik/opt/qt-5.12.0/5.12.0/gcc_64/lib/libQt5Core.so.5
#13 0x00007f92868be387 in g_main_context_dispatch () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#14 0x00007f92868be5c0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#15 0x00007f92868be64c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#16 0x00007f928af1adcf in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
---Type <return> to continue, or q <return> to quit---
   t/qt-5.12.0/5.12.0/gcc_64/lib/libQt5Core.so.5
#17 0x00007f928aec257a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /home/nik/opt/qt-5.12.0/5.12.0/gcc_64/lib/libQt5Core.so.5
#18 0x00007f928aecaf80 in QCoreApplication::exec() () at /home/nik/opt/qt-5.12.0/5.12.0/gcc_64/lib/libQt5Core.so.5
#19 0x000055dac652d972 in main(int, char**) (argc=<optimized out>, argv=<optimized out>) at main.cpp:625