Function is_good_entity_id

library/modules/Persistence.cpp:335–337

}

static bool is_good_entity_id(int entity_id) {
    return entity_id == Persistence::WORLD_ENTITY_ID || entity_id >= 0;
}

PersistentDataItem Persistence::addItem(int entity_id, const std::string &key) {
    if (!is_good_entity_id(entity_id) || key.empty() || !Core::getInstance().isWorldLoaded())