diff -r 490d5cc509ed -r cf61fcea0001 wp/wp-admin/js/revisions.js
--- a/wp/wp-admin/js/revisions.js	Tue Jun 09 11:14:17 2015 +0000
+++ b/wp/wp-admin/js/revisions.js	Mon Oct 14 17:39:30 2019 +0200
@@ -14,7 +14,7 @@
 	 */
 	revisions = wp.revisions = { model: {}, view: {}, controller: {} };
 
-	// Link post revisions data served from the back-end.
+	// Link post revisions data served from the back end.
 	revisions.settings = window._wpRevisionsSettings || {};
 
 	// For debugging
@@ -24,7 +24,7 @@
 	 * wp.revisions.log
 	 *
 	 * A debugging utility for revisions. Works only when a
-	 * debug flag is on and the browser supports it.
+	 * debug flag is on and the browser supports it.
 	 */
 	revisions.log = function() {
 		if ( window.console && revisions.debug ) {
@@ -411,6 +411,9 @@
 			// Start the router if browser supports History API
 			if ( window.history && window.history.pushState ) {
 				this.router = new revisions.Router({ model: this });
+				if ( Backbone.History.started ) {
+					Backbone.history.stop();
+				}
 				Backbone.history.start({ pushState: true });
 			}
 		},