Ticket #22312: 22312.diff

wp-includes/capabilities.php

@@ -1073 +1073 @@
                 }
 
                 $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;
                         // Prior to 3.1 we would re-call map_meta_cap here.