Ticket #20236: 20236.1.diff

wp-includes/post.php

@@ -3124 +3124 @@
 function get_all_page_ids() {
         global $wpdb;
 
-        if ( ! $page_ids = wp_cache_get('all_page_ids', 'posts') ) {
+        $page_ids = wp_cache_get('all_page_ids', 'posts');
+        if ( ! is_array( $page_ids ) ) {
                 $page_ids = $wpdb->get_col("SELECT ID FROM $wpdb->posts WHERE post_type = 'page'");
                 wp_cache_add('all_page_ids', $page_ids, 'posts');
         }