diff --git a/apps/documenteditor/forms/app/controller/ApplicationController.js b/apps/documenteditor/forms/app/controller/ApplicationController.js
index befcce86f5..99f0736681 100644
--- a/apps/documenteditor/forms/app/controller/ApplicationController.js
+++ b/apps/documenteditor/forms/app/controller/ApplicationController.js
@@ -83,7 +83,7 @@ define([
                 weakCompare     : function(obj1, obj2){return obj1.type === obj2.type;}
             });
 
-            this._state = {isDisconnected: false, licenseType: false, isDocModified: false};
+            this._state = {isDisconnected: false, licenseType: false, isDocModified: false, isFormDisconnected: false};
 
             this.view = this.createView('ApplicationView').render();
 
@@ -142,6 +142,7 @@ define([
                 this.api.asc_registerCallback('asc_onCurrentPage',           this.onCurrentPage.bind(this));
                 this.api.asc_registerCallback('asc_onDocumentModifiedChanged', _.bind(this.onDocumentModifiedChanged, this));
                 this.api.asc_registerCallback('asc_onZoomChange',           this.onApiZoomChange.bind(this));
+                this.api.asc_registerCallback('asc_onDisconnectEveryone',    _.bind(this.onDisconnectEveryone, this));
                 this.api.asc_registerCallback('asc_onCoAuthoringDisconnect', _.bind(this.onApiServerDisconnect, this));
                 Common.NotificationCenter.on('api:disconnect',               _.bind(this.onApiServerDisconnect, this));
 
@@ -662,7 +663,8 @@ define([
 
             var type = /^(?:(pdf))$/.exec(this.document.fileType); // can fill forms only in pdf format
             this.appOptions.isOFORM = !!(type && typeof type[1] === 'string');
-            this.appOptions.canFillForms   = this.appOptions.canLicense && this.appOptions.isOFORM && ((this.permissions.fillForms===undefined) ? (this.permissions.edit !== false) : this.permissions.fillForms) && (this.editorConfig.mode !== 'view');
+            this.appOptions.canFillForms = this.appOptions.canLicense && this.appOptions.isOFORM && ((this.permissions.fillForms===undefined) ? (this.permissions.edit !== false) : this.permissions.fillForms) &&
+                                           (this.editorConfig.mode !== 'view') && !this._state.isFormDisconnected;
             this.api.asc_setViewMode(!this.appOptions.canFillForms);
 
             this.appOptions.canBranding  = params.asc_getCustomization();
@@ -2235,6 +2237,16 @@ define([
             }
         },
 
+        onDisconnectEveryone: function() {
+            this._state.isFormDisconnected = true;
+            if (this.appOptions) this.appOptions.canFillForms = false;
+            this.showFillingForms(false); // hide filling forms
+            Common.UI.warning({
+                msg  : this.warnStartFilling,
+                buttons: ['ok']
+            });
+        },
+
         onEditComplete: function() {
             var me = this;
             me.boxSdk && _.defer(function(){  me.boxSdk.focus(); }, 50);
diff --git a/apps/documenteditor/forms/locale/en.json b/apps/documenteditor/forms/locale/en.json
index 1f32caa599..af390d5395 100644
--- a/apps/documenteditor/forms/locale/en.json
+++ b/apps/documenteditor/forms/locale/en.json
@@ -173,6 +173,7 @@
   "DE.Controllers.ApplicationController.warnLicenseUsersExceeded": "You've reached the user limit for %1 editors. Contact your administrator to learn more.",
   "DE.Controllers.ApplicationController.warnNoLicense": "You've reached the limit for simultaneous connections to %1 editors. This document will be opened for viewing only.<br>Contact %1 sales team for personal upgrade terms.",
   "DE.Controllers.ApplicationController.warnNoLicenseUsers": "You've reached the user limit for %1 editors. Contact %1 sales team for personal upgrade terms.",
+  "DE.Controllers.ApplicationController.warnStartFilling": "Form filling is in progress.<br>File editing is not currently available.",
   "DE.Views.ApplicationView.textClear": "Clear all fields",
   "DE.Views.ApplicationView.textClearField": "Clear field",
   "DE.Views.ApplicationView.textClose": "Close file",