"PHP Notice: Trying to get property 'area' of non-object" when creating a new TP from the TP block inside a TP

[Chrystll]

Description

I get the notice below with WordPress 6.2-beta3-55428 and and Twenty Twenty Three (only) when creating a new TP from the TP block inside a TP.

[PHP Notice:  Trying to get property 'area' of non-object in /wp-single/wp-includes/rest-api/endpoints/class-wp-rest-templates-controller.php on line 586
[PHP Stack trace:
[PHP   1. {main}() /wp-single/index.php:0
[PHP   2. require() /wp-single/index.php:17
[PHP   3. wp() /wp-single/wp-blog-header.php:16
[PHP   4. WP->main() /wp-single/wp-includes/functions.php:1330
[PHP   5. WP->parse_request() /wp-single/wp-includes/class-wp.php:780
[PHP   6. do_action_ref_array() /wp-single/wp-includes/class-wp.php:399
[PHP   7. WP_Hook->do_action() /wp-single/wp-includes/plugin.php:565
[PHP   8. WP_Hook->apply_filters() /wp-single/wp-includes/class-wp-hook.php:332
[PHP   9. rest_api_loaded() /wp-single/wp-includes/class-wp-hook.php:308
[PHP  10. WP_REST_Server->serve_request() /wp-single/wp-includes/rest-api.php:410
[PHP  11. WP_REST_Server->dispatch() /wp-single/wp-includes/rest-api/class-wp-rest-server.php:442
[PHP  12. WP_REST_Server->respond_to_request() /wp-single/wp-includes/rest-api/class-wp-rest-server.php:1028
[PHP  13. WP_REST_Templates_Controller->create_item() /wp-single/wp-includes/rest-api/class-wp-rest-server.php:1181
[PHP  14. WP_REST_Templates_Controller->prepare_item_for_database() /wp-single/wp-includes/rest-api/endpoints/class-wp-rest-templates-controller.php:400

Step-by-step reproduction instructions

1. go to /wp-admin/site-editor.php?canvas=view&path=%2Fwp_template_part&postType=wp_template_part then edit the Footer TP for example
2. add a TP block > choose "start blank" > then create your TP. This action triggers the PHP notice mentioned above.

Screenshots, screen recording, code snippet

No response

Environment info

No response

Please confirm that you have searched existing issues in the repo.

Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes

[kathrynwp]

Hi there, thanks for the report @Chrystll

Could you please confirm:

• what version of PHP does this occur with?
• does this also occur with WP 6.1.1, with Gutenberg 15.2.2 active and/or inactive?

[Chrystll]

@kathrynwp
It occurs also with WordPress 6.1.1 with Gutenberg 15.2.2 inactive.
My PHP version is 7.2.3

[Mamaduka]

I can confirm this notice. It needs to be fixed in the core, but let's keep the issue open for tracking purposes.

[t-hamano]

I was also able to reproduce it. The problem appears to occur in the template editor as well.

f3f115c7fa2a3b35a8f3ab146fde7f75.mp4

[t-hamano]

Core Ticket: https://core.trac.wordpress.org/ticket/57851
Core PR: WordPress/wordpress-develop#4165

[t-hamano]

This issue has been resolved in the core and I will close.

https://core.trac.wordpress.org/changeset/56248