PHPs warning in wp-admin when creating new posts

Hello team,

I’m getting the following PHP warnings in wp-admin when I want to create a new post, event or try to edit an episode:

Warning: Undefined array key "post_type" in [path]/wp-content/plugins/podlove-podcasting-plugin-for-wordpress/lib/podcast_post_meta_box.php on line 221

Warning: Cannot modify header information - headers already sent by (output started at [path]/wp-content/plugins/podlove-podcasting-plugin-for-wordpress/lib/podcast_post_meta_box.php:221) in [path]/wp-admin/admin-header.php on line 9

This is WordPress 6.1.1 running with PHP 8.1.16 and Podlove Publisher 3.8.4. It also happens when I try to trash a post or an event (post type added by an events plugin).

Can you help to get rid of these?

Thanks a lot!