Save corrupted

My battery on my phone goes dead in the middle of a game, I lose my save file when my battery is charged back up.

I press "Minecraft PE" icon, I try and load my save...

Minecraft PE loads so far, as in the first part of loading screen "building textures" I then get a message "Unfortunately Minecraft PE has stopped working", Mincecraft PE exits, then back to desktop. I have so many of these save files that I have worked on and that I do not want to delete

The phone I am using is a Sony Xperia Z