won't let me load world on pocket edition

i play on minecraft pocket edition and recently i was playing on my world when i went to sleep. before i woke up in the game, i exited out of the app. now every time i log in and try to reopen that specific world, it bugs out and sends me back to my phone home screen. this world is really important to me so i'm hoping there's a way to fix this. i've included a video down below in case my description wasn't exactly clear.