It is not often, but possible! And should never raise an exception then!

The Player can itself build stuff into the level. If it happens he looks a unit then, I get an exception...

Okay, I will fix it myself. I only thought you would like to do so yourself, because you made such a nice topic here, and when you later make improvements to your version and I want to have them, my bugfixing is lost. Perhaps I try to fix it and post the new unit here.

Firle