Ticket #16956: 16956.4.diff

src/wp-admin/includes/class-wp-comments-list-table.php

@@ -552 +552 @@
                 $this->comments_bubble( $post->ID, $pending_comments );
                 echo '</span> ';
                 $post_type_object = get_post_type_object( $post->post_type );
-                echo "<a href='" . get_permalink( $post->ID ) . "'>" . $post_type_object->labels->view_item . '</a>';
+                
+                if ( null !=  $post_type_object ) {
+                        echo "<a href='" . get_permalink( $post->ID ) . "'>" . $post_type_object->labels->view_item . '</a>';
+                }
+                
                 echo '</div>';
                 if ( 'attachment' == $post->post_type && ( $thumb = wp_get_attachment_image( $post->ID, array( 80, 60 ), true ) ) )
                         echo $thumb;

src/wp-includes/capabilities.php

@@ -1076 +1076 @@
                 }
 
                 $post_type = get_post_type_object( $post->post_type );
+                
+                if ( is_null( $post_type ) ) {
+                        $caps[] = 'do_not_allow';
+                        break;
+                }
 
                 if ( ! $post_type->map_meta_cap ) {
                         $caps[] = $post_type->cap->$cap;
@@ -1122 +1127 @@
                 }
 
                 $post_type = get_post_type_object( $post->post_type );
+                
+                if ( is_null( $post_type ) ) {
+                        $caps[] = 'do_not_allow';
+                        break;
+                }
+                
+                if ( is_null( $post_type ) ) {
+                        $caps[] = 'do_not_allow';
+                        break;
+                }
 
                 if ( ! $post_type->map_meta_cap ) {
                         $caps[] = $post_type->cap->$cap;