korganizer krashes when creating event

When creating new event, korganizer crashes with

QGArray::at: Absolute index 56 out of range
KCrash: Application 'korganizer' crashing...

Stacktrace:

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Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
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[Thread debugging using libthread_db enabled]
[New Thread -1240942368 (LWP 6904)]
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[KCrash handler]
#6 0xb6e526f7 in QBoxLayout::setupGeom () from /usr/lib/libqt-mt.so.3
#7 0xb6e533ca in QBoxLayout::minimumSize () from /usr/lib/libqt-mt.so.3
#8 0xb6e02431 in QLayout::totalMinimumSize () from /usr/lib/libqt-mt.so.3
#9 0xb6e5a194 in qSmartMinSize () from /usr/lib/libqt-mt.so.3
#10 0xb6e01709 in QWidgetItem::minimumSize () from /usr/lib/libqt-mt.so.3
#11 0xb6e52274 in QBoxLayout::setupGeom () from /usr/lib/libqt-mt.so.3
#12 0xb6e53468 in QBoxLayout::sizeHint () from /usr/lib/libqt-mt.so.3
#13 0xb6e02574 in QLayout::totalSizeHint () from /usr/lib/libqt-mt.so.3
#14 0xb6ea9414 in QWidget::sizeHint () from /usr/lib/libqt-mt.so.3
#15 0xb6f34e31 in QFrame::sizeHint () from /usr/lib/libqt-mt.so.3
#16 0xb6fddbcd in QWidgetStack::sizeHint () from /usr/lib/libqt-mt.so.3
#17 0xb6fc5116 in QTabWidget::sizeHint () from /usr/lib/libqt-mt.so.3
#18 0xb76e2c3c in KJanusWidget::minimumSizeHint () from /usr/lib/libkdeui.so.4
#19 0xb76e583d in KDialogBase::minimumSizeHint () from /usr/lib/libkdeui.so.4
#20 0xb76e3ed1 in KDialogBase::sizeHint () from /usr/lib/libkdeui.so.4
#21 0xb6ea5aec in qt_naturalWidgetSize () from /usr/lib/libqt-mt.so.3
#22 0xb6eab690 in QWidget::show () from /usr/lib/libqt-mt.so.3
#23 0xb7029dcb in QDialog::show () from /usr/lib/libqt-mt.so.3
#24 0xb7e9d99e in CalendarView::newEvent () from /usr/lib/libkorganizer.so.1
#25 0xb7eaadd4 in CalendarView::newEvent () from /usr/lib/libkorganizer.so.1
#26 0xb7ebf969 in CalendarView::qt_invoke () from /usr/lib/libkorganizer.so.1
#27 0xb6e73e29 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#28 0xb6e748c4 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#29 0xb76d6bd7 in KAction::activated () from /usr/lib/libkdeui.so.4
#30 0xb770c9a4 in KAction::slotActivated () from /usr/lib/libkdeui.so.4
#31 0xb770c94e in KAction::slotButtonClicked () from /usr/lib/libkdeui.so.4
#32 0xb77283b0 in KAction::qt_invoke () from /usr/lib/libkdeui.so.4
#33 0xb6e73e29 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#34 0xb77137ed in KToolBarButton::buttonClicked () from /usr/lib/libkdeui.so.4
#35 0xb77139a9 in KToolBarButton::mouseReleaseEvent ()
   from /usr/lib/libkdeui.so.4
#36 0xb6eae5fd in QWidget::event () from /usr/lib/libqt-mt.so.3
#37 0xb776a36d in KToolBarButton::event () from /usr/lib/libkdeui.so.4
#38 0xb6e09dc6 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#39 0xb6e0a350 in QApplication::notify () from /usr/lib/libqt-mt.so.3
#40 0xb7507ced in KApplication::notify () from /usr/lib/libkdecore.so.4
#41 0xb6d9b15d in QApplication::sendSpontaneousEvent ()
   from /usr/lib/libqt-mt.so.3
#42 0xb6d9680b in QETWidget::translateMouseEvent ()
   from /usr/lib/libqt-mt.so.3
#43 0xb6d94cf1 in QApplication::x11ProcessEvent () from /usr/lib/libqt-mt.so.3
#44 0xb6dae473 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#45 0xb6e228b7 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#46 0xb6e227da in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#47 0xb6e088d5 in QApplication::exec () from /usr/lib/libqt-mt.so.3
#48 0x08051650 in ?? ()
#49 0xbfe940ac in ?? ()
#50 0xbfe941c8 in ?? ()
#51 0x00000000 in ?? ()