Hello! I tried to reproduce the problem by multiplying by a large number, and, while it did produce a compilation error, but it didn't come to the point of crashing.
Does some error message appear when you try to load the page?
Okay, thanks; seems that I would have to add some error logging facility to the tool in order to make it easier to reproduce this kind of problem:
https://github.com/haroldo-ok/vcs-game-maker/issues/56