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Copy app/code/core/Mage/Wishlist/Block/Customer/Wishlist/Item/Options.php to app/code/local/Mage/Wishlist/Block/Customer/Wishlist/Item/Options.php and replace function getTemplate() line 104 - 123 with this code:

 /**
 * Retrieve block template
 *
 * @return string
 */
public function getTemplate()
{
    $template = parent::getTemplate();
    if ($template) {
        return $template;
    }

    $item = $this->getItem();

    // If $item is it not instance of Mage_Wishlist_Block_Customer_Wishlist_Item_Options
    if ($item instanceof Mage_Wishlist_Block_Customer_Wishlist_Item_Options){
        $data = $this->getOptionsRenderCfg($item->getProduct()->getTypeId());

        if (empty($data['template'])) {
            $data = $this->getOptionsRenderCfg('default');
        }
    }else{
          $data = $this->getOptionsRenderCfg('default');
    }

    return empty($data['template']) ? '' : $data['template'];
}