Ticket #39559: 39559.diff

js/load.js

@@ -202 +202 @@
                                                 // Include the array of route methods for easy reference.
                                                 methods: modelRoute.route.methods,
 
-                                                initialize: function() {
+                                                initialize: function( attributes, options ) {
+                                                        wp.api.WPApiBaseModel.prototype.initialize.call( this, attributes, options );
 
                                                         /**
                                                          * Posts and pages support trashing, other types don't support a trash