diff --git a/apps/documenteditor/main/app/controller/Viewport.js b/apps/documenteditor/main/app/controller/Viewport.js
index 852d9fc01..e6f23f65a 100644
--- a/apps/documenteditor/main/app/controller/Viewport.js
+++ b/apps/documenteditor/main/app/controller/Viewport.js
@@ -339,6 +339,7 @@ define([
             me.header.lockHeaderBtns( 'undo', _need_disable );
             me.header.lockHeaderBtns( 'redo', _need_disable );
             me.header.lockHeaderBtns( 'opts', _need_disable );
+            me.header.lockHeaderBtns( 'users', _need_disable );
         },
 
         onApiZoomChange: function(percent, type) {
diff --git a/apps/presentationeditor/main/app/controller/Viewport.js b/apps/presentationeditor/main/app/controller/Viewport.js
index b18b9a062..5da5818a1 100644
--- a/apps/presentationeditor/main/app/controller/Viewport.js
+++ b/apps/presentationeditor/main/app/controller/Viewport.js
@@ -378,6 +378,7 @@ define([
             me.header.lockHeaderBtns( 'undo', _need_disable );
             me.header.lockHeaderBtns( 'redo', _need_disable );
             me.header.lockHeaderBtns( 'opts', _need_disable );
+            me.header.lockHeaderBtns( 'users', _need_disable );
         },
 
         onApiZoomChange: function(percent, type) {
diff --git a/apps/spreadsheeteditor/main/app/controller/Viewport.js b/apps/spreadsheeteditor/main/app/controller/Viewport.js
index c7fba719a..f74a04734 100644
--- a/apps/spreadsheeteditor/main/app/controller/Viewport.js
+++ b/apps/spreadsheeteditor/main/app/controller/Viewport.js
@@ -370,6 +370,7 @@ define([
             me.header.lockHeaderBtns( 'undo', _need_disable );
             me.header.lockHeaderBtns( 'redo', _need_disable );
             me.header.lockHeaderBtns( 'opts', _need_disable );
+            me.header.lockHeaderBtns( 'users', _need_disable );
         },
 
         onApiZoomChange: function(zf, type){