Steps to reproduce:
1.Open a page with VE which has a reference note in it
2.Now place your cursor after the reference note
3.Press backspace to select the reference note
4.Now press down key to go to the next line
The cursor does not go to the next line and an error appears in the console:
Uncaught NotFoundError: Failed to execute 'selectNode' on 'Range': The node provided is null.