I am not sure what software version it is as we used it to get the basket working and since then we just copied and pasted the coding appropriately. We bought JShop in 2003 or 2004.
It says undefined twice: i.e. "undefined undefined"
It seems to have the error whenever someone has added something to their basket and then they click away and go back to the basket later. The ONLY way to get around the problem is to get rid of all the cookies in the computer and then try adding to basket again.
I am not sure if cartOutputData.php has been modified. A web designer did alter our basket code once but I am not sure what they did.
I realise there are no problems with using JShop and site rankings. I was saying that I did not want to use a PHP cart as that might interfere with site rankings (the need to have .php pages).
Would I benefit from getting a later copy of JShop? Is there a better Java Script shopping basket?