(gdb) bt
#0 0x01441eea in QScopedPointer<QGraphicsLayoutItemPrivate, QScopedPointerDelet
er<QGraphicsLayoutItemPrivate> >::data (this=0xbaadf021)
at ../../include/QtCore/../../src/corelib/tools/qscopedpointer.h:135
#1 0x0125ebbf in qGetPtrHelper<QScopedPointer<QGraphicsLayoutItemPrivate, QScop
edPointerDeleter<QGraphicsLayoutItemPrivate> > > (p=...)
at ../../include/QtCore/../../src/corelib/global/qglobal.h:2428
#2 0x0144b6b4 in QGraphicsLayoutItem::d_func (this=0xbaadf01d)
at ../../include/QtGui/../../src/gui/graphicsview/qgraphicslayoutitem.h:120
#3 0x0125e860 in QGraphicsLayoutItem::geometry (this=0xbaadf01d)
at graphicsview\qgraphicslayoutitem.cpp:801
#4 0x012951e3 in QGraphicsWidget::size (this=0xbaadf00d)
at graphicsview\qgraphicswidget.cpp:304
#5 0x00405be7 in NavigationWidgetPrivate::scale (this=0xc75d930,
widthScaleFactor=1.75, heightScaleFactor=1.75) at navigationwidget.cpp:530
#6 0x00401d6f in NavigationWidget::NavigationWidget (this=0xc75ee98, parent=
0x28fde8) at navigationwidget.cpp:157
#7 0x004068ec in RobertsUI::RobertsUI (this=0x28fde8, parent=0x0)
at robertsui.cpp:83
#8 0x0040b294 in qMain (argc=1, argv=0x3e42e8) at main.cpp:74
#9 0x0040c87a in WinMain@16 (instance=0x400000, prevInstance=0x0, cmdShow=10)
at qtmain_win.cpp:131
#10 0x0040c5a6 in main (argc=209051344, argv=0xc75df60,
__p__environ=0xc75fa50) at ../mingw/main.c:73