Ticket #25324: 25324.patch

wp-includes/capabilities.php

@@ -1075 +1075 @@
 
                 $post_type = get_post_type_object( $post->post_type );
 
+                if( is_null( $post_type ) )
+                        break;
+                
                 if ( ! $post_type->map_meta_cap ) {
                         $caps[] = $post_type->cap->$cap;
                         // Prior to 3.1 we would re-call map_meta_cap here.