Is it possible to recover a corrupt Samsung note?

I lost some notes from the app Samsung Notes and I think I know why or at least how to reproduce the event. This happens when the phone has no space left (0 free bytes). When whatsapp app makes a backup at 2am, it eats a lot of space and then a few minutes later it comes back to normal. When I click in a note to open it while the phone has 0 free bytes, the note doesn't open anymore (message: "Can't open note. File corrupt"). It also doesn't let me share it anymore or convert it to pdf or text (message: "File corrupt or not supported). The phone is a Samsung Galaxy A5. I'd like to know if the notes are really lost forever or there is something I could do. Thanks.