Steps to reproduce the issue

Joomla 4.0-dev @ 16f284f install via git (see later)

Login to admin as super admin

Crank up your debug mode to true and your error reporting to maximum in Global Config.

Install a component (I suggest Akeeba Backup)

using a git client you can see all the files added by Akeeba, trash those!

(So what this is emulating is a database with Akeeba installed, but the Akeeba files have been deleted on the hard disk, people will often delete files using FTP)

Login to admin as a super admin and navigate
System -> Manage / Extensions
Find the page with all the Akeeba items on it (I find sorting by ID Desc brings them to the first page)
select them all and click the REFRESH CACHE toolbar button

Expected result

No PHP notices

Actual result

Notice: Undefined property: stdClass::$version in /application/administrator/components/com_installer/tmpl/manage/default.php on line 116

Notice: Undefined property: stdClass::$version in /application/administrator/components/com_installer/tmpl/manage/default.php on line 132