Ahh, makes sense! It's hard to get all the edge cases down.
This reminded me of this joke:
A software tester walks into a bar. He orders a beer. Orders 0 beers. Orders 99999999999 beers. Orders a lizard. Orders -1 beers. Orders a ueicbksjdhd.
First real customer walks in, orders a beer and then asks where the bathroom is. The bar explodes.