Fatal error while purging on PHP8

When purging the cache (or saving something, which causes a purge) a Fatal error is thrown by the following line:

purge.clas.php, line 1139:
$recent_posts = $wp_widget_factory->widgets['WP_Widget_Recent_Posts'];

Because in our setup/website we’ve remove unused widgets, and thus also this one, it generates a notice. But in PHP8 the notice will cause a fatal error.

Changing the line into $recent_posts = $wp_widget_factory->widgets['WP_Widget_Recent_Posts'] ?? null; should fix it.

Would be great if this can be solved ??

Thanks!