/**
* Add an object to the collection
*
* @param \Magento\Framework\Object $object
* @return $this
* @throws LocalizedException
*/
public function addItem(\Magento\Framework\Object $object)
{
if (!$object instanceof $this->_itemObjectClass) {
throw new LocalizedException(__('Attempt to add an invalid object'));
}
return parent::addItem($object);
}