Crashes when trying to show the dash overview.

$ GRID_UNIT_PX=12 gdb -arg ./builddir/src/Dash/unity8-dash -mousetouch


#0  0x00007fffcf9c0f11 in Pool<TouchRegistry::TouchInfo>::forEach<TouchRegistry::findTouchInfo(int)::<lambda(Pool<TouchRegistry::TouchInfo>::Iterator&)> >(TouchRegistry::<lambda(Pool<TouchRegistry::TouchInfo>::Iterator&)>) (this=0x10, func=...)
    at /home/tsdgeos_work/phablet/unity8/touchOwnership/libs/UbuntuGestures/Pool.h:116
#1  0x00007fffcf9c0675 in TouchRegistry::findTouchInfo (this=0x0, id=0) at /home/tsdgeos_work/phablet/unity8/touchOwnership/libs/UbuntuGestures/TouchRegistry.cpp:380
#2  0x00007fffcf9bfdd7 in TouchRegistry::addCandidateOwnerForTouch (this=0x0, id=0, candidate=0xb67fb0) at /home/tsdgeos_work/phablet/unity8/touchOwnership/libs/UbuntuGestures/TouchRegistry.cpp:252
#3  0x00007fffcfbe4ed2 in DirectionalDragArea::touchEvent_absent (this=0xb67fb0, event=0x45f53e0) at /home/tsdgeos_work/phablet/unity8/touchOwnership/plugins/Ubuntu/Gestures/DirectionalDragArea.cpp:443
#4  0x00007fffcfbe4bf8 in DirectionalDragArea::touchEvent (this=0xb67fb0, event=0x45f53e0) at /home/tsdgeos_work/phablet/unity8/touchOwnership/plugins/Ubuntu/Gestures/DirectionalDragArea.cpp:370
#5  0x00007ffff6c6677d in QQuickItem::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007fffcfbe4606 in DirectionalDragArea::event (this=0xb67fb0, event=0x45f53e0) at /home/tsdgeos_work/phablet/unity8/touchOwnership/plugins/Ubuntu/Gestures/DirectionalDragArea.cpp:241
#7  0x00007ffff610ad05 in QCoreApplication::notify (this=<optimized out>, receiver=<optimized out>, event=<optimized out>) at kernel/qcoreapplication.cpp:997
#8  0x00007ffff610ae3b in QCoreApplication::notifyInternal (this=0x613000, receiver=0xb67fb0, event=0x45f53e0) at kernel/qcoreapplication.cpp:935
#9  0x00007ffff6c77f57 in QQuickWindowPrivate::deliverMatchingPointsToItem(QQuickItem*, QTouchEvent*, QSet<int>*, QSet<int> const&, QList<QTouchEvent::TouchPoint> const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#10 0x00007ffff6c788cb in QQuickWindowPrivate::deliverTouchPoints(QQuickItem*, QTouchEvent*, QList<QTouchEvent::TouchPoint> const&, QSet<int>*, QHash<QQuickItem*, QList<QTouchEvent::TouchPoint> >*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00007ffff6c7873e in QQuickWindowPrivate::deliverTouchPoints(QQuickItem*, QTouchEvent*, QList<QTouchEvent::TouchPoint> const&, QSet<int>*, QHash<QQuickItem*, QList<QTouchEvent::TouchPoint> >*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#12 0x00007ffff6c7873e in QQuickWindowPrivate::deliverTouchPoints(QQuickItem*, QTouchEvent*, QList<QTouchEvent::TouchPoint> const&, QSet<int>*, QHash<QQuickItem*, QList<QTouchEvent::TouchPoint> >*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#13 0x00007ffff6c7873e in QQuickWindowPrivate::deliverTouchPoints(QQuickItem*, QTouchEvent*, QList<QTouchEvent::TouchPoint> const&, QSet<int>*, QHash<QQuickItem*, QList<QTouchEvent::TouchPoint> >*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#14 0x00007ffff6c7873e in QQuickWindowPrivate::deliverTouchPoints(QQuickItem*, QTouchEvent*, QList<QTouchEvent::TouchPoint> const&, QSet<int>*, QHash<QQuickItem*, QList<QTouchEvent::TouchPoint> >*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#15 0x00007ffff6c7873e in QQuickWindowPrivate::deliverTouchPoints(QQuickItem*, QTouchEvent*, QList<QTouchEvent::TouchPoint> const&, QSet<int>*, QHash<QQuickItem*, QList<QTouchEvent::TouchPoint> >*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#16 0x00007ffff6c7873e in QQuickWindowPrivate::deliverTouchPoints(QQuickItem*, QTouchEvent*, QList<QTouchEvent::TouchPoint> const&, QSet<int>*, QHash<QQuickItem*, QList<QTouchEvent::TouchPoint> >*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#17 0x00007ffff6c78d90 in QQuickWindowPrivate::deliverTouchEvent(QTouchEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#18 0x00007ffff6c7a173 in QQuickWindow::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#19 0x00007ffff610ad05 in QCoreApplication::notify (this=<optimized out>, receiver=<optimized out>, event=<optimized out>) at kernel/qcoreapplication.cpp:997
#20 0x00007ffff610ae3b in QCoreApplication::notifyInternal (this=0x613000, receiver=0x700b10, event=0x7fffffffd520) at kernel/qcoreapplication.cpp:935
#21 0x00007ffff778b6a7 in QGuiApplicationPrivate::processTouchEvent (e=0x45f4de0) at kernel/qguiapplication.cpp:2349
#22 0x00007ffff778dd05 in QGuiApplicationPrivate::processWindowSystemEvent (e=e@entry=0x45f4de0) at kernel/qguiapplication.cpp:1511
#23 0x00007ffff777344f in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:579
#24 0x00007fffee684ca0 in userEventSourceDispatch (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:78
#25 0x00007ffff3aaac1d in g_main_dispatch (context=0x7fffe4002450) at /build/buildd/glib2.0-2.41.5/./glib/gmain.c:3064
#26 g_main_context_dispatch (context=context@entry=0x7fffe4002450) at /build/buildd/glib2.0-2.41.5/./glib/gmain.c:3663
#27 0x00007ffff3aaaf08 in g_main_context_iterate (context=context@entry=0x7fffe4002450, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.41.5/./glib/gmain.c:3734
#28 0x00007ffff3aaafbc in g_main_context_iteration (context=0x7fffe4002450, may_block=1) at /build/buildd/glib2.0-2.41.5/./glib/gmain.c:3795
#29 0x00007ffff6162397 in QEventDispatcherGlib::processEvents (this=0x6fc8f0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#30 0x00007ffff6108672 in QEventLoop::exec (this=this@entry=0x7fffffffd8a0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#31 0x00007ffff61100ec in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#32 0x0000000000405f6a in main (argc=2, argv=0x7fffffffdc58) at /home/tsdgeos_work/phablet/unity8/touchOwnership/src/Dash/main.cpp:109