problem hud.size

[serthy]

		self.txt_hud[i] destroy();
self.txt_hud[i].name = undefined; 
	

you destroy the hud[i] here, hud[i] is now undefined and size is decreased
however you set hud[i].name afterwards to undefined, therefore hud[i] is now more or less defined
(since it holds the undefined membervariable name)

		self.txt_hud[i] destroy(); 
	

should do the trick, there is no need to set it to undefined