Description

• Can you reproduce the issue?

Steps to reproduce

1. Create a paragraph with two lines, like bellow:

foo
bar

2. Put cursor before foo.
3. Press delete to delete all the content.
4. Press backspace key, the editor crashed.

Expected behavior:

The editor does not crashed.

Actual behavior:

The editor crashed

Link to an example: [optional]

Versions

• Mark Text: all
• Operating system: all