Ticket #41387: 41387.patch

src/wp-admin/js/postbox.js

@@ -284 +284 @@
                                 return;
                         }
 
+                        closedpostboxesnonce = jQuery('#closedpostboxesnonce').val();
+                        if ( !closedpostboxesnonce ) {
+                                return;
+                        }
+
                         closed = $( '.postbox' ).filter( '.closed' ).map( function() { return this.id; } ).get().join( ',' );
                         hidden = $( '.postbox' ).filter( ':hidden' ).map( function() { return this.id; } ).get().join( ',' );
 
@@ -291 +296 @@
                                 action: 'closed-postboxes',
                                 closed: closed,
                                 hidden: hidden,
-                                closedpostboxesnonce: jQuery('#closedpostboxesnonce').val(),
+                                closedpostboxesnonce: closedpostboxesnone,
                                 page: page
                         });
                 },