I'm around 85 % sure that out of skin ids 0 to 299 (AFAIK 299 is the largest skin id number and 0 is the lowest :P ) the following, and only the following, crash the game for the user: 3, 4, 5, 6, 7, ...

OMG Draco, You are the king of kings m8! thankyou!! I was working on my own save game system but it was taking ages! cheaz!