Ticket #25047: 25047-2.patch

wp-includes/js/heartbeat.js

@@ -427 +427 @@
                  */
                 this.enqueue = function( handle, data, dont_overwrite ) {
                         if ( handle ) {
-                                if ( queue.hasOwnProperty( handle ) && dont_overwrite )
+                                if ( dont_overwrite && self.isQueued( handle ) )
                                         return false;
 
                                 queue[handle] = data;
@@ -440 +440 @@
                  * Check if data with a particular handle is queued
                  *
                  * $param string handle The handle for the data
-                 * $return mixed The data queued with that handle or null
+                 * $return mixed The data queued with that handle or 'false'
                  */
                 this.isQueued = function( handle ) {
-                        return queue[handle];
+                        if ( queue.hasOwnProperty( handle ) )
+                                return queue[handle];
+
+                        return false;
                 };
         };