Version:           Kontact 4.4 rc2 (using Devel)
OS:                Linux
Installed from:    Compiled sources

When entering a new event in the Kontact and the sub-dialog with multiple folders is shown, clicking the "create new event" OK button crashes the application.

I will atach a screencast of the situation.

Here is the backtrace : 

Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#6  QSharedDataPointer (one=..., other=...) at /usr/include/qt4/QtCore/qshareddata.h:93
#7  assignEntityPrivate (one=..., other=...) at ../../akonadi/entity.cpp:49
#8  0x00a3378a in Entity (this=0xbffcf874, other=...) at ../../akonadi/entity.cpp:56
#9  0x00a594b4 in Collection (this=0xbffcf874, other=...) at ../../akonadi/collection.cpp:72
#10 0x097933fc in ?? () from /usr/lib/kde4/kcal_akonadi.so
#11 0x0978c04f in ?? () from /usr/lib/kde4/kcal_akonadi.so
#12 0x09774a4f in ?? () from /usr/lib/kde4/kcal_akonadi.so
#13 0x0976e97e in ?? () from /usr/lib/kde4/kcal_akonadi.so
#14 0x058ce8b2 in KCal::ResourceCalendar::save (this=0xabeeb88, incidence=0xb3f05d0) at ../../kcal/resourcecalendar.cpp:228
#15 0x058dd187 in KCal::CalendarResources::save (this=0xabe65e8, ticket=0xb559428, incidence=0xb3f05d0) at ../../kcal/calendarresources.cpp:863
#16 0x058df71b in KCal::CalendarResources::endChange (this=0xabe65e8, incidence=0xb3f05d0) at ../../kcal/calendarresources.cpp:920
#17 0x04130a2d in IncidenceChanger::endChange(KCal::Incidence*) () from /usr/lib/libkorganizerprivate.so.4
#18 0x0408ab9c in CalendarView::dialogClosing(KCal::Incidence*) () from /usr/lib/libkorganizerprivate.so.4
#19 0x0409d081 in CalendarView::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkorganizerprivate.so.4
#20 0x00f9b11a in QMetaObject::metacall (object=0xaaf7860, cl=4294967295, idx=166, argv=0x0) at kernel/qmetaobject.cpp:237
#21 0x00fa989b in QMetaObject::activate (sender=0xa9330a0, m=0x416fb04, local_signal_index=4, argv=0xbffcfdd8) at kernel/qobject.cpp:3294
#22 0x040a44d3 in ?? () from /usr/lib/libkorganizerprivate.so.4
#23 0x040a87cf in ?? () from /usr/lib/libkorganizerprivate.so.4
#24 0x00fa5285 in qDeleteInEventHandler (o=0xbffcf874) at kernel/qobject.cpp:4021
#25 0x00fa68d8 in QObject::event (this=0xa9330a0, e=0x8) at kernel/qobject.cpp:1243
#26 0x01673e86 in QWidget::event (this=0xa9330a0, event=0xa39c7a8) at kernel/qwidget.cpp:8428
#27 0x0161719c in QApplicationPrivate::notify_helper (this=0x9f007b0, receiver=0xa9330a0, e=0xa39c7a8) at kernel/qapplication.cpp:4242
#28 0x0161deb7 in QApplication::notify (this=0xbffd1e34, receiver=0xa9330a0, e=0xa39c7a8) at kernel/qapplication.cpp:4207
#29 0x0045fa1a in KApplication::notify (this=0xbffd1e34, receiver=0xa9330a0, event=0xa39c7a8) at ../../kdeui/kernel/kapplication.cpp:302
#30 0x00f95eab in QCoreApplication::notifyInternal (this=0xbffd1e34, receiver=0xa9330a0, event=0xa39c7a8) at kernel/qcoreapplication.cpp:704
#31 0x00f988e3 in QCoreApplication::sendEvent (receiver=0x0, event_type=0, data=0x9edc5d0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#32 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x9edc5d0) at kernel/qcoreapplication.cpp:1345
#33 0x00f98a4d in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1238
#34 0x00fc20df in QCoreApplication::sendPostedEvents (s=0x9efef10) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:220
#35 postEventSourceDispatch (s=0x9efef10) at kernel/qeventdispatcher_glib.cpp:276
#36 0x07edae88 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#37 0x07ede730 in ?? () from /lib/libglib-2.0.so.0
#38 0x07ede863 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#39 0x00fc1bd5 in QEventDispatcherGlib::processEvents (this=0x9edc0e8, flags=...) at kernel/qeventdispatcher_glib.cpp:407
#40 0x016d4b75 in QGuiEventDispatcherGlib::processEvents (this=0x9edc0e8, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#41 0x00f944c9 in QEventLoop::processEvents (this=0xbffd06b0, flags=) at kernel/qeventloop.cpp:149
#42 0x00f9491a in QEventLoop::exec (this=0xbffd06b0, flags=...) at kernel/qeventloop.cpp:201
#43 0x01b50c43 in QDialog::exec (this=0xb520f08) at dialogs/qdialog.cpp:530
#44 0x09773fa3 in ?? () from /usr/lib/kde4/kcal_akonadi.so
#45 0x0978d118 in ?? () from /usr/lib/kde4/kcal_akonadi.so
#46 0x0976f24e in ?? () from /usr/lib/kde4/kcal_akonadi.so
#47 0x058cec5b in KCal::Incidence::AddVisitor<KCal::ResourceCalendar>::visit (this=0xbffd0908, e=0xb3f05d0) at ../../kcal/incidence.h:84
#48 0x05857fc8 in KCal::Event::accept (this=0xb3f05d0, v=...) at ../../kcal/event.h:225
#49 0x058cd116 in KCal::ResourceCalendar::addIncidence (this=0xabeeb88, incidence=0xb3f05d0) at ../../kcal/resourcecalendar.cpp:120
#50 0x058dee4f in KCal::CalendarResources::addIncidence (this=0xabe65e8, incidence=0xb3f05d0) at ../../kcal/calendarresources.cpp:451
#51 0x04131a91 in IncidenceChanger::addIncidence(KCal::Incidence*, QWidget*) () from /usr/lib/libkorganizerprivate.so.4
#52 0x040a83e0 in ?? () from /usr/lib/libkorganizerprivate.so.4
#53 0x040a5f79 in ?? () from /usr/lib/libkorganizerprivate.so.4
#54 0x003c48b9 in KDialog::qt_metacall (this=0xa9330a0, _c=3221031544, _id=177418400, _a=0xbffd0d18) at ./kdialog.moc:190
#55 0x004a06ba in KPageDialog::qt_metacall (this=0xa9330a0, _c=QMetaObject::InvokeMetaMethod, _id=69, _a=0xbffd0d18) at ./kpagedialog.moc:70
#56 0x040a708a in ?? () from /usr/lib/libkorganizerprivate.so.4
#57 0x040a897a in ?? () from /usr/lib/libkorganizerprivate.so.4
#58 0x00f9b11a in QMetaObject::metacall (object=0xa9330a0, cl=4294967295, idx=0, argv=0xa9330a0) at kernel/qmetaobject.cpp:237
#59 0x00fa989b in QMetaObject::activate (sender=0xb232670, m=0x10a90f8, local_signal_index=0, argv=0xbffd0d18) at kernel/qobject.cpp:3294
#60 0x00faf053 in QSignalMapper::mapped (this=0xb232670, _t1=4) at .moc/release-shared/moc_qsignalmapper.cpp:101
#61 0x00fb02cd in QSignalMapper::map (this=0xb232670, sender=0xa994c80) at kernel/qsignalmapper.cpp:266
#62 0x00fb04ae in QSignalMapper::map (this=0xb232670) at kernel/qsignalmapper.cpp:257
#63 0x00fb057b in QSignalMapper::qt_metacall (this=0xb232670, _c=QMetaObject::InvokeMetaMethod, _id=4, _a=0xbffd0eb8) at .moc/release-shared/moc_qsignalmapper.cpp:87
#64 0x00f9b11a in QMetaObject::metacall (object=0xb232670, cl=4294967295, idx=8, argv=0xbffd0eb8) at kernel/qmetaobject.cpp:237
#65 0x00fa989b in QMetaObject::activate (sender=0xa994c80, m=0x1f49a04, local_signal_index=2, argv=0xbffd0eb8) at kernel/qobject.cpp:3294
#66 0x01d3a789 in QAbstractButton::clicked (this=0xa994c80, _t1=false) at .moc/release-shared/moc_qabstractbutton.cpp:206
#67 0x01a1d519 in QAbstractButtonPrivate::emitClicked (this=0xac90e30) at widgets/qabstractbutton.cpp:546
#68 0x01a1e364 in QAbstractButtonPrivate::click (this=0xac90e30) at widgets/qabstractbutton.cpp:539
#69 0x01a1e611 in QAbstractButton::mouseReleaseEvent (this=0xa994c80, e=0xbffd1580) at widgets/qabstractbutton.cpp:1118
#70 0x01673f9e in QWidget::event (this=0xa994c80, event=0xbffd1580) at kernel/qwidget.cpp:7974
#71 0x01a1d3be in QAbstractButton::event (this=0xa994c80, e=0x8) at widgets/qabstractbutton.cpp:1080
#72 0x01ac6b12 in QPushButton::event (this=0xa994c80, e=0xbffd1580) at widgets/qpushbutton.cpp:664
#73 0x0161719c in QApplicationPrivate::notify_helper (this=0x9f007b0, receiver=0xa994c80, e=0xbffd1580) at kernel/qapplication.cpp:4242
#74 0x0161e76b in QApplication::notify (this=0xbffd1e34, receiver=0xa994c80, e=0xbffd1580) at kernel/qapplication.cpp:3822
#75 0x0045fa1a in KApplication::notify (this=0xbffd1e34, receiver=0xa994c80, event=0xbffd1580) at ../../kdeui/kernel/kapplication.cpp:302
#76 0x00f95eab in QCoreApplication::notifyInternal (this=0xbffd1e34, receiver=0xa994c80, event=0xbffd1580) at kernel/qcoreapplication.cpp:704
#77 0x0161d71f in QCoreApplication::sendEvent (receiver=0xa994c80, event=0xbffd1580, alienWidget=0xa994c80, nativeWidget=0xaa0a7c0, buttonDown=0x1f52060, lastMouseReceiver=..., spontaneous=true)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#78 QApplicationPrivate::sendMouseEvent (receiver=0xa994c80, event=0xbffd1580, alienWidget=0xa994c80, nativeWidget=0xaa0a7c0, buttonDown=0x1f52060, lastMouseReceiver=..., spontaneous=true)
    at kernel/qapplication.cpp:2956
#79 0x016a6d18 in QETWidget::translateMouseEvent (this=0xaa0a7c0, event=0xbffd1a9c) at kernel/qapplication_x11.cpp:4368
#80 0x016a61f1 in QApplication::x11ProcessEvent (this=0xbffd1e34, event=0xbffd1a9c) at kernel/qapplication_x11.cpp:3379
#81 0x016d504a in x11EventSourceDispatch (s=0x9f09fa8, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#82 0x07edae88 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#83 0x07ede730 in ?? () from /lib/libglib-2.0.so.0
#84 0x07ede863 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#85 0x00fc1bd5 in QEventDispatcherGlib::processEvents (this=0x9edc0e8, flags=...) at kernel/qeventdispatcher_glib.cpp:407
#86 0x016d4b75 in QGuiEventDispatcherGlib::processEvents (this=0x9edc0e8, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#87 0x00f944c9 in QEventLoop::processEvents (this=0xbffd1d94, flags=) at kernel/qeventloop.cpp:149
#88 0x00f9491a in QEventLoop::exec (this=0xbffd1d94, flags=...) at kernel/qeventloop.cpp:201
#89 0x00f98b0f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:981
#90 0x01617237 in QApplication::exec () at kernel/qapplication.cpp:3570
#91 0x0804b4b6 in _start ()