Link to users wishlist not working

I have just installed this plugin to find out the link to a users wishlist isn’t working, my wishlist page is called /shortlist/ which is fine as that works when a user adds a item to the list it shows there however if the sharing is enabled and the user or someone else clicks on the link /shortlist/&wish=1 (for user id 1) it goes to a page not found, can anyone shed any light on this please?

https://wordpress.org/plugins/gd-mylist/