Game crashes while entering a world where you are going through the endportal back to the overworld

there is nothing much to say except the game crashes instantly ( I was gonna take a screenshot but the game crashes just like I said instantly...) I would also upload the world but the world is 94,2Mb big. I also drop on fps and Cpu Clock rate so I would assume it has sth. to do with entities.

http://www.mediafire.com/file/qk08x2yf1ewtv0p/K%C3%B6ln.mcworld