Crash when riding horse

I was riding my horse down a hill to a village. When I saw the village,the game became no-response,about 5 seconds later,it crashed.

 

I entered the world later,I found that my horse vanished. The game crahsed again when I moved my sight. I restarted the game and entered the world again and again,and the game always crashed in 5 seconds after I entering the world.