Back link problem after sending a contact request

-- HikaShop version -- : 2.3.0
-- Joomla version -- : 3.1
-- PHP version -- : 5..5

I encountered a problem in following situation:

-product title has special characters (e.g.: Ø)
-product alias is set without special characters
-sef urls are activated

After sending a request via the "Contact us for more information" button, I get following confirmation dialog:

Hi,

Generally with SEF urls what is important are the ids. the url should looks like: http:/mywebsite.com/product/15-product-name.
Are you still using IDs in the urls ?
The problem seem to come from the controller product "components/com_hikashop/controllers/product.php" function "send_email()". Thanks to try to use for testing purpose:

$app->enqueueMessage(JText::sprintf('CLICK_HERE_TO_GO_BACK_TO_PRODUCT',hikashop_completeLink('product&task=show&cid='.$product->product_id.'&name='.$product->product_alias.$url_itemid)));

$app->enqueueMessage(JText::sprintf('CLICK_HERE_TO_GO_BACK_TO_PRODUCT',hikashop_completeLink('product&task=show&cid='.$product->product_id.'&name='.$product->alias.$url_itemid)));

Hi Xavier,

this works but I lost SEF urls so I would be http:/mywebsite.com/product/15-

I did some more investigations and found out that this problem only occurs if i use products with characteristics.

In this case the product_id (cid in the url) is the one of the variant but the alias becomes the product name(!) of the main form.

Okay, everything works fine after replacing

$app->enqueueMessage(JText::sprintf('CLICK_HERE_TO_GO_BACK_TO_PRODUCT',hikashop_completeLink('product&task=show&cid='.$product->product_id.'&name='.$product->alias.$url_itemid)));

if($product->product_type=='variant'){
	$alias = $parentProduct->alias;
}else{
	$alias = $product->alias;
}
$app->enqueueMessage(JText::sprintf('CLICK_HERE_TO_GO_BACK_TO_PRODUCT',hikashop_completeLink('product&task=show&cid='.$product->product_id.'&name='.$alias.$url_itemid)));