TypeError - Feed.php:160 - "date(): Argument #2 ($timestamp) must be of type ?int, bool given"

[tobimori]

    [
      'pattern' => 'sitemap.xml',
      'method' => 'GET',
      'action'  => function () {
        $feed = site()->index()->listed()->limit(50000)->sitemap(['images' => false, 'videos' => false]);
        return $feed;
      }
    ],

any idea?

[bnomei]

https://github.com/bnomei/kirby3-feed/blob/ae2668a9e037d46e54680b142c257bf8f578b14e/snippets/feed/sitemap.php#L17