QGraphicsItem crashes in destructor

QGraphicsItem crashes in destructor with following backtraces:

Backtrace 1:
#0 QGraphicsItem::panel (this=0x6c0079) at graphicsview/qgraphicsitem.cpp:1655
No locals.
#1 0x3b87c964 in QGraphicsItemPrivate::setSubFocus (this=0x2e5eb8,
rootItem=0x0, stopItem=0x0) at graphicsview/qgraphicsitem.cpp:5566
parent = 0x6c0079
#2 0x3b889f34 in QGraphicsItemPrivate::setParentItemHelper (this=0x2c4b30,
newParent=0x0, newParentVariant=<value optimized out>,
thisPointerVariant=0xaeeecb70) at graphicsview/qgraphicsitem.cpp:1257
q = 0x2c4aa0
p = <value optimized out>
parentFocusScopeItem = 0x0
newFocusScopeItem = <value optimized out>
#3 0x3b88a380 in QGraphicsItem::setParentItem (this=0x2c4aa0, newParent=0x0)
at graphicsview/qgraphicsitem.cpp:1712
newParentVariant = {d = {data =

{c = 0 '\000', i = 0, u = 0, b = false, d = -1.2682194472817687e-82, f = 0, real = 0, ll = -5841507435000365056, ull = 12605236638709186560, o = 0x0, ptr = 0x0, shared = 0x0}

, type = 288, is_shared = 0, is_null = 0}, static
handler = 0x3bd6ec24}
thisPointerVariant = {d = {data =

{c = 160 '\240', i = 2902688, u = 2902688, b = 160, d = 4.4501477170144028e-308, f = 4.06753224e-39, real = 4.06753224e-39, ll = 9393986832452256, ull = 9393986832452256, o = 0x2c4aa0, ptr = 0x2c4aa0, shared = 0x2c4aa0}

, type = 288, is_shared = 0, is_null = 0}, static handler =
0x3bd6ec24}
#4 0x3b8c2998 in QGraphicsScenePrivate::removeItemHelper (this=0x180c60,
item=0x2c4aa0) at graphicsview/qgraphicsscene.cpp:622
q = 0x17b800
oldScene = 0x17b800
oldSelectedItemsSize = 999208832
dummy = <value optimized out>
#5 0x3b88b3d4 in QGraphicsItem::~QGraphicsItem (this=0x2c4aa0,
__in_chrg=<value optimized out>) at graphicsview/qgraphicsitem.cpp:1486
p = 0x0
#6 0x3b8ed4a0 in ~QGraphicsObject (this=0x2c4a98, __in_chrg=<value optimized
out>) at ../../include/QtGui/../../src/gui/graphicsview/qgraphicsitem.h:547
No locals.
#7 QGraphicsWidget::~QGraphicsWidget (this=0x2c4a98, __in_chrg=<value
optimized out>) at graphicsview/qgraphicswidget.cpp:277

Backtrace 2:
Program received signal SIGSEGV, Segmentation fault.
QGraphicsItemPrivate::clearSubFocus (this=0x0, rootItem=0x29bd40, stopItem=0x0) at graphicsview/qgraphicsitem.cpp:5590
5590 graphicsview/qgraphicsitem.cpp: No such file or directory.
in graphicsview/qgraphicsitem.cpp
(gdb) bt full
#0 QGraphicsItemPrivate::clearSubFocus (this=0x0, rootItem=0x29bd40, stopItem=0x0) at graphicsview/qgraphicsitem.cpp:5590
parent = 0x29bd40
#1 0x3b889c1c in QGraphicsItemPrivate::setParentItemHelper (this=0x2a61c8, newParent=0x0, newParentVariant=<value optimized out>,
thisPointerVariant=0xaecafba0) at graphicsview/qgraphicsitem.cpp:1115
q = 0x2a6138
p = <value optimized out>
parentFocusScopeItem = <value optimized out>
newFocusScopeItem = <value optimized out>
#2 0x3b88a380 in QGraphicsItem::setParentItem (this=0x2a6138, newParent=0x0) at graphicsview/qgraphicsitem.cpp:1712
newParentVariant = {d = {data =

{c = 0 '\000', i = 0, u = 0, b = false, d = -2.7781227556831115e-83, f = 0, real = 0, ll = -5851587551445385216, ull = 12595156522264166400, o = 0x0, ptr = 0x0, shared = 0x0}

, type = 288, is_shared = 0, is_null = 0}, static handler = 0x3bd6ec24}
thisPointerVariant = {d = {data =

{c = 56 '8', i = 2777400, u = 2777400, b = 56, d = 4.4501477170144028e-308, f = 3.89196635e-39, real = 3.89196635e-39, ll = 9360073770557752, ull = 9360073770557752, o = 0x2a6138, ptr = 0x2a6138, shared = 0x2a6138}

, type = 288,
is_shared = 0, is_null = 0}, static handler = 0x3bd6ec24}
#3 0x3b8c2998 in QGraphicsScenePrivate::removeItemHelper (this=0x16f810, item=0x2a6138) at graphicsview/qgraphicsscene.cpp:622
q = 0x16deb0
oldScene = 0x16deb0
oldSelectedItemsSize = 999208832
dummy = <value optimized out>
#4 0x3b88b3d4 in QGraphicsItem::~QGraphicsItem (this=0x2a6138, __in_chrg=<value optimized out>) at graphicsview/qgraphicsitem.cpp:1486
p = 0x0
#5 0x3b8ed4a0 in ~QGraphicsObject (this=0x2a6130, __in_chrg=<value optimized out>) at ../../include/QtGui/../../src/gui/graphicsview/qgraphicsitem.h:547
No locals.
#6 QGraphicsWidget::~QGraphicsWidget (this=0x2a6130, __in_chrg=<value optimized out>) at graphicsview/qgraphicswidget.cpp:277

Patch in attachement "patch" fixes this crash.

However this patch doesn't solve the root cause for this crash, actual problem is in qgraphicsitem.cpp - row 5592: if (parent->d_ptr->subFocusItem != q_ptr || parent == stopItem)

In case where crash happens it seems that parent == stopItem has been true, so by removing this condition from if-clause also fixes this problem. However I'm not sure if this affects to other functionality of this class so I think code maintainer should investigate this.

Original error report can be found in https://projects.maemo.org/bugzilla/show_bug.cgi?id=214064.