Navigation: Deleting the Page List block with the Delete key crashes its parent Navigation Block

[priethor]

Description

When deleting the Page List block within a Navigation block with the Delete key, if it is the only child block, the parent Navigation block crashes:

Step-by-step reproduction instructions

1. Add a Navigation block
2. Click on "Add all pages"
3. Select the recently added Page List block
4. Delete it with the Delete key

This doesn't reproduce if:

• There are/were other blocks in the Navigation block.
• The Page List block is deleted through the toolbar option.
• Any other block is deleted following these steps.

Expected behaviour

To see an empty Navigation in its placeholder state.

Actual behaviour

The block has encountered an error and cannot be previewed, with the following console error:

Error: An error occurred while running 'mapSelect': Cannot read property 'title' of undefined
The error may be correlated with this previous error:
TypeError: Cannot read property 'title' of undefined

Screenshots or screen recording (optional)

Grabacion.de.pantalla.2021-05-18.a.las.11.28.47.mov

WordPress information

• WordPress version: 5.7.1
• Gutenberg version: 10.6.0
• Are all plugins except Gutenberg deactivated? Yes
• Are you using a default theme (e.g. Twenty Twenty-One)? No (Kadence)

[talldan]

I think this is the same issue as #29498

[priethor]

Thanks, closing this as duplicate!