Product with invalid combination - bug or normal behaviour?

[soee]

Hi all, 

 

we are using PrestaShop 1.7 and our products have various combinations set. It all works pretty good in frontend except one situation when user enters modified url where he want to load product with combination that is not related to it. For example:

 

valid url: tshirts/10-40-tshirt.html#/42-color-green/28-size-l

invalid url: valid url: tshirts/10-1000-tshirt.html#/42-color-green/28-size-l

 

The second one has combination id 1000 passed through and the result is that product loads itself with images from all combinations and price 0 and active button to add to basked. Is this bug and can we prevent it so the product will load only with existing combination?