in a visual studio multi project solution in debug mode after I clicked on delete button to see its working or not, I forgot to continue debug and clicked to delete another Item from the cart. now the program receives error that cart is null and it is stopped working.
what should I do?
[[First error after starting the program](https://i.sstatic.net/fz5Lx2T6.png)](https://i.sstatic.net/BHsgaEGz.png)