Kontact crashing with signal 6

Kontact in Kubuntu Jaunty updated everyday crashes with this log:

$ kontact
Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
Calling appendChild() on a null node does nothing.
kontact(17293) Sonnet::Loader::loadPlugin: Successfully loaded plugin: "kspell_enchant.desktop"
kontact(17293) Sonnet::Loader::loadPlugin: Successfully loaded plugin: "kspell_hspell.desktop"
kontact(17293) KWallet::Wallet::openWallet: Pass a valid window to KWallet::Wallet::openWallet().
kontact(17293) Akregator::PluginManager::query: Plugin trader constraint: "[X-KDE-akregator-framework-version] == 2 and [X-KDE-akregator-plugintype] == 'storage' and [X-KDE-akregator-rank] > 0"
kontact(17293) Akregator::PluginManager::createFromService: Trying to load: "akregator_mk4storage_plugin"
kontact(17293) Akregator::PluginManager::dump: PluginManager Service Info:
---------------------------
name : "Backend archiviazione metakit"
library : "akregator_mk4storage_plugin"
desktopEntryPath : "akregator_mk4storage_plugin.desktop"
X-KDE-akregator-plugintype : "storage"
X-KDE-akregator-name : "metakit"
X-KDE-akregator-authors : ("Frank Osterfeld")
X-KDE-akregator-rank : "255"
X-KDE-akregator-version : "1"
X-KDE-akregator-framework-version: "2"
Object::connect: No such signal Akregator::SubscriptionListView::signalContextMenu(K3ListView*, Akregator::TreeNode*, const QPoint&) in /build/buildd/kdepim-4.2.1/akregator/src/mainwidget.cpp:139
Object::connect: (sender name: 'feedtree')
Object::connect: (receiver name: 'akregator_view')
Object::connect: No such signal Akregator::SubscriptionListView::signalDropped (KUrl::List &, Akregator::TreeNode*, Akregator::Folder*) in /build/buildd/kdepim-4.2.1/akregator/src/mainwidget.cpp:143
Object::connect: (sender name: 'feedtree')
Object::connect: (receiver name: 'akregator_view')
kontact(17293) Akregator::MainWidget::setFeedList: new feed list is %p old one: %p Akregator::FeedList(0x9fd56a8) QObject(0x0)
Object::connect: No such signal Akregator::Part::showPart() in /build/buildd/kdepim-4.2.1/kontact/plugins/akregator/akregator_plugin.cpp:102
Object::connect: (receiver name: 'akregator')
kontact(17293) Akregator::FeedList::readFromOpml: loading OPML feed "opml"
kontact(17293) Akregator::FeedList::readFromOpml: measuring startup time: START
kontact(17293) Akregator::Backend::FeedStorageMK4Impl::FeedStorageMK4Impl: "http://news.google.it/news?um=1&ned=it&hl=it&q=android&output=rss"
kontact(17293) Akregator::Backend::FeedStorageMK4Impl::FeedStorageMK4Impl: "http://www.tuttoandroid.net/feed/"
kontact(17293) Akregator::Backend::FeedStorageMK4Impl::FeedStorageMK4Impl: "http://androidup.com/feed/"
kontact(17293) Akregator::Backend::FeedStorageMK4Impl::FeedStorageMK4Impl: "http://akregator.sf.net/rss2.php"
kontact(17293) Akregator::Backend::FeedStorageMK4Impl::FeedStorageMK4Impl: "http://akregator.pwsp.net/blog/?feed=rss2"
kontact(17293) Akregator::Backend::FeedStorageMK4Impl::FeedStorageMK4Impl: "http://www.kde.org/dotkdeorg.rdf"
kontact(17293) Akregator::Backend::FeedStorageMK4Impl::FeedStorageMK4Impl: "http://planetkde.org/rss20.xml"
kontact(17293) Akregator::Backend::FeedStorageMK4Impl::FeedStorageMK4Impl: "http://www.kde.org/dot/kde-apps-content.rdf"
kontact(17293) Akregator::Backend::FeedStorageMK4Impl::FeedStorageMK4Impl: "http://www.kde.org/kde-look-content.rdf"
kontact(17293) Akregator::FeedList::readFromOpml: measuring startup time: STOP, 10 ms
kontact(17293) Akregator::FeedList::readFromOpml: Number of articles loaded: 134
kontact(17293) Akregator::MainWidget::setFeedList: new feed list is %p old one: %p Akregator::FeedList(0x9f46700) Akregator::FeedList(0x9fd56a8)
ciso@M1330:~$ kontact(17293) Akregator::ExpireItemsCommand::Private::createDeleteJobs: Associated feed list was deleted, could not expire items
kontact(17293) <unnamed>::UrlHandler::UrlHandler: UrlHandler() (iCalendar)
ASSERT failure in QVector<T>::operator[]: "index out of range", file /usr/include/qt4/QtCore/qvector.h, line 335
*** KMail got signal 6 (Crashing)
KCrash: Application 'kontact' crashing...