SQL error since 3.1 update

I’m seeing the following error in my error log from time to time since updating to 3.1:

WordPress database error You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'AND comment_type != 'webhook_delivery' ORDER BY comment_date_gmt DESC LIMIT 5' at line 1 for query SELECT wp_comments.* FROM wp_comments AND comment_type != 'webhook_delivery' ORDER BY comment_date_gmt DESC LIMIT 50 made by require('wp-blog-header.php'), wp, WP->main, WP->query_posts, WP_Query->query, WP_Query->get_posts

I have not yet been able to pinpoint what pages are loaded, etc., when the error occurs. I will update with that info if I can narrow it down.