diff --git a/addons/web/__openerp__.py b/addons/web/__openerp__.py
index 8a103ecc7e0..d83636de0f9 100644
--- a/addons/web/__openerp__.py
+++ b/addons/web/__openerp__.py
@@ -81,7 +81,8 @@ This module provides the core of the OpenERP Web Client.
         "static/test/search.js",
         "static/test/Widget.js",
         "static/test/list.js",
-        "static/test/list-editable.js"
+        "static/test/list-editable.js",
+        "static/test/mutex.js"
     ],
     'bootstrap': True,
     'twitter': False,
diff --git a/addons/web/static/src/js/view_form.js b/addons/web/static/src/js/view_form.js
index bc35364309a..6cedfa03d8c 100644
--- a/addons/web/static/src/js/view_form.js
+++ b/addons/web/static/src/js/view_form.js
@@ -622,6 +622,8 @@ instance.web.FormView = instance.web.View.extend(instance.web.form.FieldManagerM
                         return self._process_save(save_obj).then(function() {
                             save_obj.ret = _.toArray(arguments);
                             return iterate();
+                        }, function() {
+                            save_obj.error = true;
                         });
                     }
                     return $.when();
@@ -805,6 +807,8 @@ instance.web.FormView = instance.web.View.extend(instance.web.form.FieldManagerM
         var save_obj = {prepend_on_create: prepend_on_create, ret: null};
         this.save_list.push(save_obj);
         return this._process_operations().then(function() {
+            if (save_obj.error)
+                return $.Deferred().reject();
             return $.when.apply($, save_obj.ret);
         });
     },
diff --git a/addons/web/static/test/mutex.js b/addons/web/static/test/mutex.js
new file mode 100644
index 00000000000..e88911b5b45
--- /dev/null
+++ b/addons/web/static/test/mutex.js
@@ -0,0 +1,60 @@
+openerp.testing.section('mutex', {
+    dependencies: ['web.coresetup'],
+    setup: function (instance) {
+    }
+}, function (test) {
+    test('simpleScheduling', function (instance) {
+        var m = new $.Mutex();
+        var def1 = $.Deferred();
+        var def2 = $.Deferred();
+        var p1 = m.exec(function() { return def1; });
+        var p2 = m.exec(function() { return def2; });
+        equal(p1.state(), "pending");
+        equal(p2.state(), "pending");
+        def1.resolve();
+        equal(p1.state(), "resolved");
+        equal(p2.state(), "pending");
+        def2.resolve();
+        equal(p1.state(), "resolved");
+        equal(p2.state(), "resolved");
+    });
+    test('simpleScheduling2', function (instance) {
+        var m = new $.Mutex();
+        var def1 = $.Deferred();
+        var def2 = $.Deferred();
+        var p1 = m.exec(function() { return def1; });
+        var p2 = m.exec(function() { return def2; });
+        equal(p1.state(), "pending");
+        equal(p2.state(), "pending");
+        def2.resolve();
+        equal(p1.state(), "pending");
+        equal(p2.state(), "pending");
+        def1.resolve();
+        equal(p1.state(), "resolved");
+        equal(p2.state(), "resolved");
+    });
+    test('reject', function (instance) {
+        var m = new $.Mutex();
+        var def1 = $.Deferred();
+        var def2 = $.Deferred();
+        var def3 = $.Deferred();
+        var p1 = m.exec(function() {return def1;});
+        var p2 = m.exec(function() {return def2;});
+        var p3 = m.exec(function() {return def3;});
+        equal(p1.state(), "pending");
+        equal(p2.state(), "pending");
+        equal(p3.state(), "pending");
+        def1.resolve();
+        equal(p1.state(), "resolved");
+        equal(p2.state(), "pending");
+        equal(p3.state(), "pending");
+        def2.reject();
+        equal(p1.state(), "resolved");
+        equal(p2.state(), "rejected");
+        equal(p3.state(), "pending");
+        def3.resolve();
+        equal(p1.state(), "resolved");
+        equal(p2.state(), "rejected");
+        equal(p3.state(), "resolved");
+    });
+});