Ticket #23216: 23216-autosave.diff

wp-includes/js/autosave.js

@@ -246 +246 @@
 
 function autosave_enable_buttons() {
         jQuery(document).trigger('autosave-enable-buttons');
-        if ( ! wp.heartbeat.hasConnectionError() ) {
+        if ( ! wp.heartbeat || ! wp.heartbeat.hasConnectionError() ) {
                 // delay that a bit to avoid some rare collisions while the DOM is being updated.
                 setTimeout(function(){
                         var parent = jQuery('#submitpost');