minor error

Im getting this notice in the log’s

Non fatal error triggered on: https://****.com/2017/12/13/games-are-going-ahead/ Array
(
[type] => 2
[message] => Trying to access array offset on value of type null
[file] => /*******/public_html/wp-content/plugins/activitypub/includes/class-comment.php
[line] => 376

)

I suggest line 376 should instead be:

} elseif ( ! empty( $comment_meta[‘source_id’][0]) && $fallback ) {