Error page 404 when select a product

-- url of the page with the problem -- : www.gundogz.nl
-- HikaShop version -- : 2.6.0
-- Joomla version -- : 3.4.5
-- PHP version -- : 5.5.18
-- Browser(s) name and version -- : firefox

Hi all,

The last 2 days i get a error page 404 when i select a product for detail information.
When i go to menu:
Dummy -> Canvas dummy -> and select one of the products, thats give a 404.

I can i this item to the cart.

There are a few products that give the detail information.
Dummy -> Canvas 3 delige -> and select the ony product, it give me the detail information.

Can you help me for this problem, i can't find a solution and what's going wrong.

Thanks for you support

gr Eduard Leeuwestein

Update,

I don't know what is changed, but when I'm looking at:
Dummy -> Canvas dummy -> and select the product, it give me the detail information.
this open the page:
www.gundogz.nl/webshop/index.php/product...ummy-1lb-500gr-groen

The other menu-item:
Dummy -> Canvas 3 delige opens the link:

www.gundogz.nl/webshop/index.php?option=...&category_pathway=43

And a thirth product opens an other link:

Dummy Bal -> Wild Dummy Bal
www.gundogz.nl/webshop/index.php/compone...-bal-zonder?Itemid=0

I made a rol back put the problem is still there.

I found the problem and solution:

www.hikashop.com/forum/product-category-...category.html#218759

Greetz,

Eduard