I keep glitching out of the game and I cannot play this game.

I changed my skin, and later I left then opened the app again, but it kept closing out back to the home screen. I cannot play and I’m scared about loosing my data and worlds b/c I’m not on a Xbox account. Please fix this bug so I can play Minecraft agin. I’m not able to even see the menu of Minecraft. I reset my iPad to an earlier backup but after I fixed it, the same thing happened again, and my backup got erased so I have no way to fix it again. This same thing happened to my friends iPhone, she changed the skin and then her Minecraft broke. She had to delete the whole app. But I do not want to delete my data and worlds, please fix this bug so I can play Minecraft again.