Hi again,
The plugin does not need any update.

I see from your debug log that

$bp = buddypress();

$table = $bp->notifications->table_name;

That is issuing error. Theere are only 2 possibilities.

1. A plugin/code you are using is misbehaving and firing wp_head too early(on/before init)
2. Or you have Notifications component disabled.

I am making a guess that most probably the plugin causing it is https://wordpress.org/plugins/wp-cerber/ as it seems from the name of the hooks.

Can you please try disabling it for a minute and check the error again.

Thank you
Brajesh