Panic in qs60style.cpp while drawing a QTreeView

At least in the Symbian WINSCW emulator (not Nokia Qt simulator), my app crashes at the last line of the following excerpt of qs60style.cpp
case PE_PanelItemViewRow: // ### Qt 5: remove
#ifndef QT_NO_ITEMVIEWS
if (const QStyleOptionViewItemV4 *vopt = qstyleoption_cast<const QStyleOptionViewItemV4 *>(option)) {
if (vopt->palette.base().texture().cacheKey() != QS60StylePrivate::m_themePalette->base().texture().cacheKey()) {

QS60StylePrivate::m_themePalette is null in my case.

A modified Qt-standard-example is attached, which demonstrates the error.