Ticket #2878: theme-compat.php.patch

includes/core/theme-compat.php

@@ -383 +383 @@
         // Set the $post global
         $post = new WP_Post( (object) $dummy );
 
+        // Add $post to cache to fix the bug if page template loads
+        // comments and triggers the error with missing post
+        wp_cache_add($post->ID, $post, 'posts');
+
         // Copy the new post global into the main $wp_query
         $wp_query->post       = $post;
         $wp_query->posts      = array( $post );