Fatal error: Call to undefined method WP_Meta_Query::get_clauses() in /wp-includes/comment.php

[novazembla]

Hi,

I just upgraded one of my websites from WP 4.1.1 to 4.2.2 since this upgrade I get the following error while loading the comments.php of my custom theme. I've disabled all comments related plugins (Akismet & Disqus) and still get the error. Unfortunately I cannot provide steps to reproduce the error on a blank install.

Fatal error: Call to undefined method WP_Meta_Query::get_clauses() in /path-to-website-root/wp-includes/comment.php on line 962

A websearch finds many blogs with a similar error message but no solution. I believe that it might be a core bug. While I don't know the inner workings of the comment engine and especially the use of the in WP 4.2 introduced get_clauses wrapping the error producing fragment into a method_exists call avoids the error

if (method_exists($this->meta_query, "get_clauses")){
  $meta_query_clauses = $this->meta_query->get_clauses();
  if ( $meta_query_clauses ) {
    $allowed_keys = array_merge( $allowed_keys, array_keys( $meta_query_clauses ) );
  }
}

Many thanks!

[novazembla]

Core code did not fully update. Once done bug disappeared...

[boonebgorges]

Aha. Thanks so much for reporting back.

[SonjaWP]

Hi,

I have the same error on my web page ​http://fun-baby-games.com/ but I made latest update to WordPress 4.4 and the error disappear. Thank you for helping me :)