diff --git a/web/org.openbravo.warehouse.advancedwarehouseoperations/source/maintasks/obawo-tasks-view.js b/web/org.openbravo.warehouse.advancedwarehouseoperations/source/maintasks/obawo-tasks-view.js
index ee25d315794f63743d27983f9e83f2908c1d34fc..737e663e6890a03088b0e8c57a0f91806d087e5c 100644
--- a/web/org.openbravo.warehouse.advancedwarehouseoperations/source/maintasks/obawo-tasks-view.js
+++ b/web/org.openbravo.warehouse.advancedwarehouseoperations/source/maintasks/obawo-tasks-view.js
@@ -1,6 +1,6 @@
 /*
  ************************************************************************************
- * Copyright (C) 2016-2020 Openbravo S.L.U.
+ * Copyright (C) 2016-2021 Openbravo S.L.U.
  * Licensed under the Openbravo Commercial License version 1.0
  * You may obtain a copy of the License at http://www.openbravo.com/legal/obcl.html
  * or in the legal folder of this module distribution.
@@ -211,7 +211,7 @@ enyo.kind({
             ) {
               localModel.set('priority', model.get('priority'));
               serverTaskCollection.remove(serverTaskCollection.at(idx));
-              serverTaskCollection.add(localModel, { at: idx });
+              serverTaskCollection.add(localModel, { at: idx, silent: true });
             }
           });
         });
diff --git a/web/org.openbravo.warehouse.advancedwarehouseoperations/source/models/centralbroker.js b/web/org.openbravo.warehouse.advancedwarehouseoperations/source/models/centralbroker.js
index c89a2c5c697254f2789de4d1cc62224e0968c13d..491f914ed49cf88816a5d15b97a2a07b1bba1885 100644
--- a/web/org.openbravo.warehouse.advancedwarehouseoperations/source/models/centralbroker.js
+++ b/web/org.openbravo.warehouse.advancedwarehouseoperations/source/models/centralbroker.js
@@ -1,6 +1,6 @@
 /*
  ************************************************************************************
- * Copyright (C) 2016-2020 Openbravo S.L.U.
+ * Copyright (C) 2016-2021 Openbravo S.L.U.
  * Licensed under the Openbravo Commercial License version 1.0
  * You may obtain a copy of the License at http://www.openbravo.com/legal/obcl.html
  * or in the legal folder of this module distribution.
@@ -298,7 +298,7 @@
       var me = this;
       if (collection && collection.length > 0) {
         _.each(collection.models, function(itm) {
-          if (itm.get('isHeader') || !itm.get('behaveAsGroup')) {
+          if (itm && (itm.get('isHeader') || !itm.get('behaveAsGroup'))) {
             var planedToSendTasks = args.messages.getElements();
             if (planedToSendTasks.length > 0) {
               if (