Update all feeds metadata error

[lmjst]

Hi,
When I click "Update all feeds metadata"

I receive the following message :

Internal error
Error: Call to a member function format() on null in /home/d/www/pod/inc/Feed.php:44
Stack trace:
#0 /home/d/www/pod/inc/GPodder.php(180): Feed->sync(Object(DB))
#1 /home/d/www/pod/inc/GPodder.php(226): GPodder->updateFeedForSubscription(232)
#2 /home/d/www/pod/index.php(154): GPodder->updateAllFeeds()
#3 {main}

I'm not bright enough to understand the error.

PHP version 8.01
Gpod sync version from 2 days ago from github

The column "Action" on page /subscriptions is not updated since april '24 although feeds on gpodder client are regularly updated.

Thanks
cd