Problems with app not opening

Everytime I try to login it automatically sends me back to my home screen its not letting me access the app and I cant delete it cuz I have all my information on this app so Im basically stuck if I delete the app and download it again all my media will be gone. I need help someone please help me fix this issue without having to delete this app

Zahourii_16 about Pic Lock 3 Ultimate Free - Lock your Photo & Video, Note, Password, Contact, Message, Todos, Location, and Audio., v3.2.1