(gdb) bt
#0 0x010b1eea in QScopedPointer<QGraphicsLayoutItemPrivate, QScopedPointerDeleter<QGraphicsLayoutItemPrivate> >::data (this=0xbaadf021)
at ../../include/QtCore/../../src/corelib/tools/qscopedpointer.h:135
#1 0x00ecebbf in qGetPtrHelper<QScopedPointer<QGraphicsLayoutItemPrivate, QScopedPointerDeleter<QGraphicsLayoutItemPrivate> > > (p=...)
at ../../include/QtCore/../../src/corelib/global/qglobal.h:2428
#2 0x010bb6b4 in QGraphicsLayoutItem::d_func (this=0xbaadf01d) at ../../include/QtGui/../../src/gui/graphicsview/qgraphicslayoutitem.h:120
#3 0x00ece860 in QGraphicsLayoutItem::geometry (this=0xbaadf01d) at graphicsview\qgraphicslayoutitem.cpp:801
#4 0x00f051e3 in QGraphicsWidget::size (this=0xbaadf00d) at graphicsview\qgraphicswidget.cpp:304
#5 0x00405be7 in NavigationWidgetPrivate::scale (this=0xc8ad930, widthScaleFactor=1.75, heightScaleFactor=1.75) at navigationwidget.cpp:530
#6 0x00401d6f in NavigationWidget::NavigationWidget (this=0xc8aee98, 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=0xaf442d8) 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=210427600, argv=0xc8adf60, __p__environ=0xc8af9f0) at ../mingw/main.c:73
(gdb)