As already mentioned, this is your special topic. Your app \ design \ frontend \ default \ template \ wishlist.phtml file calls $ this-> getPriceHtml () and passes the wish list item when it expects a product.
Example:
$this->getPriceHtml($_item);
When he expects:
$this->getPriceHtml($_item->getProduct());
But you are sure to make more mistakes if the topic was written for an older version of Magento.
source share