@PB____ I don't believe there are any errors in my code, but it does a lot of swapping of data. It would previously in earlier builds of F4NS call the error of a stack overflow to a random line way out of scope (including a negative line), but more recent patches just have it crash the entire program instead. Technically speaking, it shouldn't crash at all, but developing a programming language is a bit more sophisticated because there are many different routes that could be taken by the end user that perhaps the programmers didn't take into account. Still, we're over 6 months since F4NS had been released, and this is one of the things that still plagues it.