My world doesn't work

I have surivival world since 2017. I've played very much on this world and did amazing things. After latest update when I want to play on this world, Minecraft app stops working and I'm in my iPad menu. Everytime when I click on my world it loads for a while and then throws me from Minecraft. Please fix this cause this world is very imprortant to me 

PS: Sorry for my bad English, it's not my main language.