kirbytext() fails, if text contains a link to a non-existing page

[tritrics]

Description

With the new link-field in Kirby 4 it is possible to add links to intern pages in textarea fields. This looks like this:

(link: page://sk0iiTNRft7shn6R text: Link)

If the page is deleted afterwards or if the ID is manually changed by the user, the link-conversion by kirbytext() causes an php fatal error.

Expected behavior
Link should be removed because it's not valid.

To reproduce

1. Add a page A
2. Link to page A in a textarea field on page B
3. delete page A
4. use <?= $page->textareafield()->kirbytext() ?> in a template

Your setup

Kirby Version
Kirby 4

Console output
Call to a member function url() on null in /kirby/config/tags.php line 200