Fatal error due to broken comment query callback

[janboddez]

There's an issue here:

wordpress-webmention/includes/class-comment-walker.php

Line 295 in a9129f4

$query = current( $query->query_vars['meta_query'] );

This alters completely overwrites (but only when a meta_query array is present) $query, which is passed by reference.

And leads to a fatal error later on, when this code is run:

wordpress-webmention/includes/class-comment-walker.php

Line 307 in a9129f4

$query->query_vars['type__not_in'] = get_webmention_comment_type_names();

Originally reported at janboddez/indieblocks#180.

[pfefferle]

Should be fixed on 5.3.1! Thanks for your fast help!