How to delete notes with the name `null` on android?

How do I delete notes with the name null on android?

At first I made a real big note (round about 20000 Lines). This worked on Windows 10, but after syncing, I got problems with the android app. As a result, I now have two notes with the name null, which I cannot get deleted. Any tipps (other than delete and sync again)?

Oh yes, there is a solution: Drag the important notes from the folder with the null-notes to an other notebook and delete the notebook. Now sync, create a new notebook and drag the important notes back.