foreach (Stanza st, stanzas)
    {
        InventoryItem * item = new InventoryItem(st);
        QString path = item->getPath();
^^^^
      crash

Stanza: QList of a struct (StanzaEntry) which contains a QString and a QStringList

InventoryItem::InventoryItem(const Stanza & stanza)
{
    foreach (StanzaEntry en, stanza)
    {
        if (en.sym == "path")
        {
            I(en.vals.size() == 1);
            path = en.vals.at(0);
            continue;
        }
   .....