Ticket #17118: 17118.2.diff

wp-includes/query.php

@@ -2465 +2465 @@
                 }
 
                 // Parse the meta query again if query vars have changed.
-                if ( $this->query_vars_changed ) {
+                if ( $this->query_vars_changed && isset( $q['meta_query'] ) ) {
                         $meta_query_hash = md5( serialize( $q['meta_query'] ) );
                         $_meta_query = $q['meta_query'];
                         unset( $q['meta_query'] );