If your PTR(QTreeQWidgetItem) macro yields QTreeWidgetItem*, then item is not initialized by createTreeItem function.
The simplest and most logical fix seems to change createTreeItem function to return new item:
QTreeWidgetItem* createTreeItem(PTR(QTreeWidgetItem) parent, PTR(QTreeWidgetItem) item,
CREF(QString) name, ItemType itemType)
{
item = new QTreeWidgetItem(parent);
item->setText(0, name);
item->setData(0, Qt::UserRole, QVariant(itemType));
return item;
}
and use the returned value to initialize m_pText.