Ticket #21309: 21309.12.diff

wp-includes/post.php

@@ -3494 +3494 @@
         $cache = array();
         $key = md5( serialize( compact(array_keys($defaults)) ) );
         if ( $cache = wp_cache_get( 'get_pages', 'posts' ) ) {
-                if ( is_array($cache) && isset( $cache[ $key ] ) ) {
+                if ( is_array($cache) && isset( $cache[ $key ] ) && is_array( $cache[ $key ] ) ) {
                         // Convert to WP_Post instances
                         $pages = array_map( 'get_post', $cache[ $key ] );
                         $pages = apply_filters( 'get_pages', $pages, $r );