wordpress -> wordpress stopped working

I’ve just posted a new event on u3acommunities, https://u3acommunities.org/event/3d-printing/, and since its running the ActivityPub plugin (+ event bridge), the event appears on mastodon https://mastodon.social/@[email protected]/115327830478178767 and I can also see it on frendica.world.

Great so far !

However, my personal web site, https://plord.co.uk/, no-longer see’s these posts (it used to until about 3 weeks ago or so). (Note that https://plord.co.uk/ displays friends posts at the bottom)

The friends page at https://plord.co.uk/friends/u3a-communities/ shows the u3acommunities logo and description but no posts. Only “Unfortunately, we could not find a post.”

I did notice that the feed url that was detected, https://u3acommunities.org/?author=0, doesn’t show the events (only posts).

At one point I did get an error email with

When seeking help with this issue, you may be asked for some of the following information:
WordPress version 6.8.3
Active theme: Astra (version 4.11.12)
Current plugin: Friends (version 3.6.0)
PHP version 8.2.29



Error Details
=============
An error of type E_ERROR was caused in line 1368 of the file /var/www/html/public_html/wp-content/plugins/friends/feed-parsers/class-feed-parser-activitypub.php. Error message: Uncaught TypeError: Cannot access offset of type string on string in /var/www/html/public_html/wp-content/plugins/friends/feed-parsers/class-feed-parser-activitypub.php:1368
Stack trace:
#0 /var/www/html/public_html/wp-content/plugins/friends/feed-parsers/class-feed-parser-activitypub.php(1104): Friends\Feed_Parser_ActivityPub->handle_incoming_delete()
#1 /var/www/html/public_html/wp-content/plugins/friends/feed-parsers/class-feed-parser-activitypub.php(792): Friends\Feed_Parser_ActivityPub->process_incoming_activity()
#2 /var/www/html/public_html/wp-content/plugins/friends/includes/class-feed.php(182): Friends\Feed_Parser_ActivityPub->fetch_feed()
#3 /var/www/html/public_html/wp-content/plugins/friends/includes/class-admin.php(2165): Friends\Feed->preview()
#4 /var/www/html/public_html/wp-includes/class-wp-hook.php(324): Friends\Admin->render_admin_add_friend()
#5 /var/www/html/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters()
#6 /var/www/html/public_html/wp-includes/plugin.php(517): WP_Hook->do_action()
#7 /var/www/html/public_html/wp-admin/admin.php(260): do_action()
#8 {main}
 thrown

Any debugging hints ?

Thanks