Ticket #36157: wp.36157.numeric-permalink.patch

wp-admin/includes/post.php

@@ -1227 +1227 @@
                 $post->post_name = sanitize_title($name ? $name : $title, $post->ID);
 
         $post->post_name = wp_unique_post_slug($post->post_name, $post->ID, $post->post_status, $post->post_type, $post->post_parent);
+        if ($post->ID === (int) $post->post_name) {
+                return array('', '');
+        }
 
         $post->filter = 'sample';
 
@@ -1289 +1292 @@
 
         list($permalink, $post_name) = get_sample_permalink($post->ID, $new_title, $new_slug);
 
+        if ($permalink === '' && $post_name === '') {
+                return '';
+        }
+
         $view_link = false;
         $preview_target = '';