Regression: creator crashes when loading old session

#0 0x00007fffd7552f2f in ProjectExplorer::FolderNode::<lambda()>::operator()(void) const (__closure=0x4edf800)
at ../../../../creator-master/src/plugins/projectexplorer/projectnodes.cpp:622
#1 0x00007fffd7554de9 in QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, ProjectExplorer::FolderNode::replaceSubtree(ProjectExplorer::Node*, ProjectExplorer::Node*)::<lambda()> >::call(ProjectExplorer::FolderNode::<lambda()> &, void **) (f=...,
arg=0x7fffffffcf58)
at ../../../../qt-511-build/qtbase/include/QtCore/../../../../qt-511/qtbase/src/corelib/kernel/qobjectdefs_impl.h:128
#2 0x00007fffd7554cad in QtPrivate::Functor<ProjectExplorer::FolderNode::replaceSubtree(ProjectExplorer::Node*, ProjectExplorer::Node*)::<lambda()>, 0>::call<QtPrivate::List<>, void>(ProjectExplorer::FolderNode::<lambda()> &, void *, void **) (f=..., arg=0x7fffffffcf58)
at ../../../../qt-511-build/qtbase/include/QtCore/../../../../qt-511/qtbase/src/corelib/kernel/qobjectdefs_impl.h:238
#3 0x00007fffd7554746 in QtPrivate::QFunctorSlotObject<ProjectExplorer::FolderNode::replaceSubtree(ProjectExplorer::Node*, ProjectExplorer::Node*)::<lambda()>, 0, QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase *, QObject *, void **, bool *) (which=1,
this_=0x4edf7f0, r=0x0, a=0x7fffffffcf58, ret=0x0)
at ../../../../qt-511-build/qtbase/include/QtCore/../../../../qt-511/qtbase/src/corelib/kernel/qobjectdefs_impl.h:421
#4 0x00007ffff658c6e3 in QtPrivate::QSlotObjectBase::call (a=0x7fffffffcf58, r=<optimized out>, this=<optimized out>)
at ../../include/QtCore/../../../../qt-511/qtbase/src/corelib/kernel/qobjectdefs_impl.h:376
#5 QSingleShotTimer::timerEvent (this=0x4c03be0) at /home/jarek/dev/qt-511/qtbase/src/corelib/kernel/qtimer.cpp:318
#6 0x00007ffff6580cf8 in QObject::event (this=0x4c03be0, e=<optimized out>)
at /home/jarek/dev/qt-511/qtbase/src/corelib/kernel/qobject.cpp:1232
#7 0x00007ffff6f3bced in QApplicationPrivate::notify_helper (this=this@entry=0x641860, receiver=receiver@entry=0x4c03be0,
e=e@entry=0x7fffffffd2c0) at /home/jarek/dev/qt-511/qtbase/src/widgets/kernel/qapplication.cpp:3725
#8 0x00007ffff6f42fda in QApplication::notify (this=0x7fffffffd6d0, receiver=0x4c03be0, e=0x7fffffffd2c0)
at /home/jarek/dev/qt-511/qtbase/src/widgets/kernel/qapplication.cpp:3097
#9 0x00007ffff6550a2c in QCoreApplication::notifyInternal2 (receiver=0x4c03be0, event=event@entry=0x7fffffffd2c0)
at /home/jarek/dev/qt-511/qtbase/src/corelib/kernel/qcoreapplication.cpp:1048
#10 0x00007ffff65a90d8 in QCoreApplication::sendEvent (event=0x7fffffffd2c0, receiver=<optimized out>)
at ../../include/QtCore/../../../../qt-511/qtbase/src/corelib/kernel/qcoreapplication.h:234
#11 QTimerInfoList::activateTimers (this=0x6f6c90) at /home/jarek/dev/qt-511/qtbase/src/corelib/kernel/qtimerinfo_unix.cpp:643
#12 0x00007ffff65a987f in timerSourceDispatch (source=<optimized out>)
at /home/jarek/dev/qt-511/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:182
#13 0x00007ffff1cb2bb7 in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#14 0x00007ffff1cb2f60 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#15 0x00007ffff1cb2fec in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#16 0x00007ffff65a9bb8 in QEventDispatcherGlib::processEvents (this=0x6ae190, flags=...)
at /home/jarek/dev/qt-511/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:423
#17 0x00007fffe9cefa39 in QPAEventDispatcherGlib::processEvents (this=0x6ae190, flags=...)
at /home/jarek/dev/qt-511/qtbase/src/platformsupport/eventdispatchers/qeventdispatcher_glib.cpp:69
#18 0x00007ffff654eb4d in QEventLoop::processEvents (this=this@entry=0x7fffffffd550, flags=..., flags@entry=...)
at /home/jarek/dev/qt-511/qtbase/src/corelib/kernel/qeventloop.cpp:136
#19 0x00007ffff654ef62 in QEventLoop::exec (this=this@entry=0x7fffffffd550, flags=flags@entry=...)
at /home/jarek/dev/qt-511/qtbase/src/corelib/kernel/qeventloop.cpp:214
#20 0x00007ffff655889a in QCoreApplication::exec () at /home/jarek/dev/qt-511/qtbase/src/corelib/kernel/qcoreapplication.cpp:1336
#21 0x00007ffff6900a3e in QGuiApplication::exec () at /home/jarek/dev/qt-511/qtbase/src/gui/kernel/qguiapplication.cpp:1750
#22 0x00007ffff6f3bbcd in QApplication::exec () at /home/jarek/dev/qt-511/qtbase/src/widgets/kernel/qapplication.cpp:2899
#23 0x0000000000410a64 in main (argc=1, argv=0x7fffffffdee8) at ../../../creator-master/src/app/main.cpp:598