added some safety checking
added some safety checking

nakijun/vtp,nakijun/vtp,markraz/vtp,seanisom/vtp,nakijun/vtp,nakijun/vtp,nakijun/vtp,seanisom/vtp,markraz/vtp,markraz/vtp,seanisom/vtp,seanisom/vtp,seanisom/vtp,markraz/vtp,markraz/vtp