[Solved] My level crashes the game!

[ethics]

I've built a level with standart puzzles, custom stuff, and notes, monsters and so on...

When I did everything in this level, I want to go out and change the map via a level door. But when I access this door, every sound just stops (music, sounds of torches) and the game crashes! I can't go out of the level anymore!
Are there any known bugs or solutions?

I can post my script and the .map file if you want.