Thanks for trying it out! I'm currently hunting this bug down, I thought I had it fixed days ago :(.
Strangely all the working menu and credits scenes run pretty much the same code. Happily (for anyone playing, not for me trying to fix it) it doesn't always crash, so you can get to see the level eventually if you try again.
I know this is a lousy solution, I hope to have a build in the next few days where it never happens.