Steps to reproduce the issue

Set php error reporting to maximum
In Joomla 6.0+ open an article for editing and try to insert a page break using the xtd-editor button

Expected result

Modal opens for you to enter the title etc without error

Actual result

Warning
: Attempt to read property "id" on null in
D:\repos\j6\administrator\components\com_content\src\View\Article\HtmlView.php
on line
139

Warning
: Attempt to read property "checked_out" on null in
D:\repos\j6\administrator\components\com_content\src\View\Article\HtmlView.php
on line
140

System information (as much as possible)

Confirmed working in 5.x
Not working in 6.0-dev or 6.1-dev
php 8.4.18

Additional comments

Last change to this file was made #45913