The app closes when trying to open my world after the app updated

Ever since the last minecraft update the app has been sluggish and laggy, and whenever I try to open my world Terrasen the app crashes and closes right when its about to finish generating my world. I know this has to be an app bug cuz I managed to export my world file to a friend's Galaxy S8 and it works just fine there, but when we put it on my other friend's iphone it crashed just like mine. Please I need help with this issue, I can play online with my friends, enter servers, create and enter new worlds and all of that the only thing it wont let me open is my precious world please help me I'll really appreciate it. And I'll attach my world file just in case there's something you can do. Pleaseee. Thanks in advance