Crash in Qml Designer when pressing on "add state" (and qmlpuppet2 is missing)

Qt Creator 2.6 built with Qt5. Opening a QtQuick 2.0 file in the designer and pressing the "add state" button. Crash:

0 raise /lib/x86_64-linux-gnu/libc.so.6 0x7ffff5540445
1 abort /lib/x86_64-linux-gnu/libc.so.6 0x7ffff5543bab
2 qt_message_fatal qlogging.cpp 806 0x7ffff60872c6
3 QMessageLogger::fatal qlogging.cpp 355 0x7ffff608548e
4 qt_assert_x qglobal.cpp 1948 0x7ffff6080beb
5 QList<QPointer<QDeclarativeItem> >::takeAt qlist.h 470 0x7fffd035324b
6 QDeclarativeRepeater::itemsRemoved qdeclarativerepeater.cpp 408 0x7fffd0352bcd
7 QDeclarativeRepeater::qt_static_metacall moc_qdeclarativerepeater_p.cpp 153 0x7fffd03c906f
8 QMetaObject::activate qobject.cpp 3440 0x7ffff6296db4
9 QMetaObject::activate qobject.cpp 3315 0x7ffff6296716
10 QDeclarativeVisualModel::itemsRemoved moc_qdeclarativevisualitemmodel_p.cpp 251 0x7fffd03ceadf
11 QDeclarativeVisualDataModel::_q_itemsRemoved qdeclarativevisualitemmodel.cpp 1318 0x7fffd036aed2
12 QDeclarativeVisualDataModel::_q_rowsRemoved qdeclarativevisualitemmodel.cpp 1376 0x7fffd036b31c
13 QDeclarativeVisualDataModel::qt_static_metacall moc_qdeclarativevisualitemmodel_p.cpp 587 0x7fffd03cf1a3
14 QMetaObject::activate qobject.cpp 3440 0x7ffff6296db4
15 QMetaObject::activate qobject.cpp 3315 0x7ffff6296716
16 QAbstractItemModel::rowsRemoved moc_qabstractitemmodel.cpp 415 0x7ffff631e5c9
17 QAbstractItemModel::endRemoveRows qabstractitemmodel.cpp 2573 0x7ffff62087ed
18 QmlDesigner::StatesEditorModel::removeState stateseditormodel.cpp 161 0x7fffc43c8f60
19 QmlDesigner::StatesEditorView::nodeRemoved stateseditorview.cpp 272 0x7fffc43cc105
20 QmlDesigner::Internal::ModelPrivate::notifyNodeRemoved model.cpp 965 0x7fffc427c374
21 QmlDesigner::Internal::ModelPrivate::removeNode model.cpp 288 0x7fffc4276a43
22 QmlDesigner::ModelNode::destroy modelnode.cpp 638 0x7fffc428f1d7
23 QmlDesigner::Internal::ModelAmender::typeDiffers texttomodelmerger.cpp 1553 0x7fffc42bede3
24 QmlDesigner::Internal::TextToModelMerger::syncNode texttomodelmerger.cpp 850 0x7fffc42ba1b1
25 QmlDesigner::Internal::TextToModelMerger::syncNodeListProperty texttomodelmerger.cpp 1161 0x7fffc42bd08a
26 QmlDesigner::Internal::TextToModelMerger::syncArrayProperty texttomodelmerger.cpp 1122 0x7fffc42bcd39
27 QmlDesigner::Internal::TextToModelMerger::syncNode texttomodelmerger.cpp 882 0x7fffc42ba580
28 QmlDesigner::Internal::TextToModelMerger::load texttomodelmerger.cpp 787 0x7fffc42b9689
29 QmlDesigner::RewriterView::qmlTextChanged rewriterview.cpp 709 0x7fffc4257c5d
30 QmlDesigner::RewriterView::qt_static_metacall moc_rewriterview.cpp 85 0x7fffc43ddf4a
31 QMetaObject::activate qobject.cpp 3440 0x7ffff6296db4
32 QMetaObject::activate qobject.cpp 3315 0x7ffff6296716
33 QmlDesigner::TextModifier::textChanged moc_textmodifier.cpp 150 0x7fffc43dfce1
34 QmlDesigner::PlainTextEditModifier::reactivateChangeSignals plaintexteditmodifier.cpp 200 0x7fffc42c70d6
35 QmlDesigner::Internal::ModelToTextMerger::applyChanges modeltotextmerger.cpp 290 0x7fffc42b313b
36 QmlDesigner::RewriterView::applyChanges rewriterview.cpp 498 0x7fffc42564fd
37 QmlDesigner::RewriterView::nodeReparented rewriterview.cpp 277 0x7fffc4255789
38 QmlDesigner::Internal::ModelPrivate::notifyNodeReparent model.cpp 1210 0x7fffc427ed0c
39 QmlDesigner::Internal::ModelPrivate::reparentNode model.cpp 1510 0x7fffc4281392
40 QmlDesigner::NodeAbstractProperty::reparentHere nodeabstractproperty.cpp 99 0x7fffc42afc80
41 QmlDesigner::NodeListProperty::reparentHere nodelistproperty.cpp 116 0x7fffc42a8010
42 QmlDesigner::QmlModelStateGroup::addState qmlitemnode.cpp 333 0x7fffc42cfb19
43 QmlDesigner::StatesEditorView::addState stateseditorview.cpp 144 0x7fffc43ca92f
44 QmlDesigner::StatesEditorView::createNewState stateseditorview.cpp 117 0x7fffc43ca2a6
45 QmlDesigner::StatesEditorView::qt_static_metacall moc_stateseditorview.cpp 79 0x7fffc43ecc9c
46 QMetaObject::activate qobject.cpp 3440 0x7ffff6296db4
47 QMetaObject::activate qobject.cpp 3315 0x7ffff6296716
48 QMetaObject::activate qobject.cpp 3489 0x7ffff62971da
49 QDeclarativeVMEMetaObject::metaCall qdeclarativevmemetaobject.cpp 634 0x7fffd016b4cc
50 QAbstractDynamicMetaObject::metaCall qobject_p.h 336 0x7fffd0163e30
51 QMetaObject::metacall qmetaobject.cpp 305 0x7ffff625ec65
52 QDeclarativeObjectMethodScriptClass::callMethod qdeclarativeobjectscriptclass.cpp 981 0x7fffd022844e
53 QDeclarativeObjectMethodScriptClass::callPrecise qdeclarativeobjectscriptclass.cpp 948 0x7fffd0228149
54 QDeclarativeObjectMethodScriptClass::call qdeclarativeobjectscriptclass.cpp 917 0x7fffd0227c46
55 QScript::DeclarativeObjectDelegate::call qscriptdeclarativeobject.cpp 154 0x7fffd3c4055e
56 QTJSC::NativeFuncWrapper::operator() CallData.cpp 46 0x7fffd3b56027
57 QTJSC::cti_op_call_NotJSFunction JITStubs.cpp 1780 0x7fffd3b2e945
58 QTJSC::JITThunks::tryCacheGetByID JITStubs.cpp 926 0x7fffd3b2b4c1
59 ?? 0x7fffffffa450
60 ?? 0x7fffc010d100
61 ?? 0xa
62 ?? 0x1
63 ??