The following patch can fix this issue (provided by Bjørn Erik Nilsen):

diff --git
a/plugins/declarative/organizer/qdeclarativeorganizermodel.cpp
b/plugins/declarative/organizer/qdeclarativeorganizermo
index 940a525..e5f46f8 100644
— a/plugins/declarative/organizer/qdeclarativeorganizermodel.cpp
+++ b/plugins/declarative/organizer/qdeclarativeorganizermodel.cpp
@@ -960,7 +960,11 @@ void QDeclarativeOrganizerModel::itemsRemoved(const
QList<QOrganizerItemId>& ids

QVariant QDeclarativeOrganizerModel::data(const QModelIndex &index, int role) const
{

• QDeclarativeOrganizerItem* di = d->m_items.value(index.row());
  + if (index.row() < 0 || index.row() > d->m_items.count())
  + return QVariant();
  +
  + QDeclarativeOrganizerItem* di = d->m_items.at(index.row());
  + Q_ASSERT(di);
  QOrganizerItem item = di->item();
  switch(role) {
  case Qt::DisplayRole:

Note: The ContactModel code may have the same issue.