Merge pull request #1838 from ONLYOFFICE/fix/bug-57826

Fix  Bug 57826

apps/documenteditor/forms/app.js

@@ -126,6 +126,8 @@ require([
     'gateway',
     'locale'
 ], function (Backbone, Bootstrap, Core) {
+    if (Backbone.History && Backbone.History.started)
+        return;
     Backbone.history.start();
 
     /**

apps/documenteditor/forms/app_dev.js

@@ -116,6 +116,8 @@ require([
     'sockjs',
     'underscore'
 ], function (Backbone, Bootstrap, Core) {
+    if (Backbone.History && Backbone.History.started)
+        return;
     Backbone.history.start();
 
     /**

apps/documenteditor/main/app.js

@@ -133,6 +133,8 @@ require([
     'gateway',
     'locale'
 ], function (Backbone, Bootstrap, Core) {
+    if (Backbone.History && Backbone.History.started)
+        return;
     Backbone.history.start();
 
     /**

apps/documenteditor/main/app_dev.js

@@ -123,6 +123,8 @@ require([
     'sockjs',
 	'underscore'
 ], function (Backbone, Bootstrap, Core) {
+    if (Backbone.History && Backbone.History.started)
+        return;
     Backbone.history.start();
 
     /**

apps/presentationeditor/main/app.js

@@ -132,6 +132,8 @@ require([
     'gateway',
     'locale'
 ], function (Backbone, Bootstrap, Core) {
+    if (Backbone.History && Backbone.History.started)
+        return;
     Backbone.history.start();
 
     /**

apps/presentationeditor/main/app_dev.js

@@ -123,6 +123,8 @@ require([
     'xregexp',
     'underscore'
 ], function (Backbone, Bootstrap, Core) {
+    if (Backbone.History && Backbone.History.started)
+        return;
     Backbone.history.start();
 
     /**

apps/spreadsheeteditor/main/app.js

@@ -132,6 +132,8 @@ require([
     'gateway',
     'locale'
 ], function (Backbone, Bootstrap, Core) {
+    if (Backbone.History && Backbone.History.started)
+        return;
     Backbone.history.start();
 
     /**

apps/spreadsheeteditor/main/app_dev.js

@@ -122,6 +122,8 @@ require([
 	'sockjs',
 	'underscore'
 ], function (Backbone, Bootstrap, Core) {
+    if (Backbone.History && Backbone.History.started)
+        return;
     Backbone.history.start();
 
     /**