The levels are very small (just rooms in a mansion).
I tried something like that (mini main function):
level_load([first_room]);
wait(-5);
level_load([second_room]);
wait(-5);
In this case the crash didn't occur, but I'm not sure if this is a useful information. If it is an issue with a texture or model inside one of the levels, would this always lead into a crash? I guess that it might also depend on the total memory consumption, doesn't it?
I'm pretty sure that you are trying to access something that wasn't just created yet, and that causes the crash. That can explain why in situation above everything works. You wait for 5 seconds, so it makes sure that everything get's created on the level. What do you have under that -5 seconds? Maybe that's the key to your crash?
Greets
