My minecraft world won't load? - 1

I made a survival minecraft world on the iPhone pocket edition. I've been using an x-ray mod I got from an app and it didn't have any bad effects for ages. I'd use it to mine for a while and then turn it off and reload the game, but last time I entered that world I was collecting wool by hitting sheep and it force quit on me randomly. I wasn't using the x-ray add on or any other add ons at the time and all my other worlds and my realms work fine, but when I try to load the x-ray world, x-ray on or off, the loading bar fills but it never actually enters the game and leaves the loading screen. Anyone got any tips? I've tried closing and re-opening the app and loading other worlds and stuff but to no avail.