diff --git a/base_user_role/i18n/ca.po b/base_user_role/i18n/ca.po
index 31731e33..a3b5de29 100644
--- a/base_user_role/i18n/ca.po
+++ b/base_user_role/i18n/ca.po
@@ -8,8 +8,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Odoo Server 10.0\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2017-02-22 00:55+0000\n"
-"PO-Revision-Date: 2017-02-22 00:55+0000\n"
+"POT-Creation-Date: 2017-08-01 02:44+0000\n"
+"PO-Revision-Date: 2017-08-01 02:44+0000\n"
 "Last-Translator: OCA Transbot <transbot@odoo-community.org>, 2017\n"
 "Language-Team: Catalan (https://www.transifex.com/oca/teams/23907/ca/)\n"
 "MIME-Version: 1.0\n"
@@ -134,7 +134,7 @@ msgid "Role"
 msgstr ""
 
 #. module: base_user_role
-#: model:ir.model.fields,field_description:base_user_role.field_res_users_role_line_ids_1497
+#: model:ir.model.fields,field_description:base_user_role.field_res_users_role_line_ids_1510
 msgid "Role lines"
 msgstr ""
 
@@ -189,7 +189,7 @@ msgstr ""
 #: model:ir.model.fields,field_description:base_user_role.field_res_users_role_users
 #: model:ir.ui.view,arch_db:base_user_role.view_res_users_role_form
 msgid "Users"
-msgstr ""
+msgstr "Usuaris"
 
 #. module: base_user_role
 #: model:ir.model,name:base_user_role.model_res_users_role_line
diff --git a/base_user_role/i18n/pt.po b/base_user_role/i18n/pt.po
index 96305a03..a843a10e 100644
--- a/base_user_role/i18n/pt.po
+++ b/base_user_role/i18n/pt.po
@@ -3,15 +3,15 @@
 # * base_user_role
 # 
 # Translators:
-# OCA Transbot <transbot@odoo-community.org>, 2016
-# Pedro Castro Silva <pedrocs@sossia.pt>, 2016
+# OCA Transbot <transbot@odoo-community.org>, 2017
+# Pedro Castro Silva <pedrocs@sossia.pt>, 2017
 msgid ""
 msgstr ""
-"Project-Id-Version: Odoo Server 10.0c\n"
+"Project-Id-Version: Odoo Server 10.0\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2016-12-17 02:07+0000\n"
-"PO-Revision-Date: 2016-12-17 02:07+0000\n"
-"Last-Translator: Pedro Castro Silva <pedrocs@sossia.pt>, 2016\n"
+"POT-Creation-Date: 2017-08-01 02:44+0000\n"
+"PO-Revision-Date: 2017-08-01 02:44+0000\n"
+"Last-Translator: Pedro Castro Silva <pedrocs@sossia.pt>, 2017\n"
 "Language-Team: Portuguese (https://www.transifex.com/oca/teams/23907/pt/)\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
@@ -135,7 +135,7 @@ msgid "Role"
 msgstr ""
 
 #. module: base_user_role
-#: model:ir.model.fields,field_description:base_user_role.field_res_users_role_line_ids_1519
+#: model:ir.model.fields,field_description:base_user_role.field_res_users_role_line_ids_1510
 msgid "Role lines"
 msgstr ""
 
@@ -190,7 +190,7 @@ msgstr ""
 #: model:ir.model.fields,field_description:base_user_role.field_res_users_role_users
 #: model:ir.ui.view,arch_db:base_user_role.view_res_users_role_form
 msgid "Users"
-msgstr ""
+msgstr "Utilizadores"
 
 #. module: base_user_role
 #: model:ir.model,name:base_user_role.model_res_users_role_line
diff --git a/base_user_role/models/user.py b/base_user_role/models/user.py
index 30f80711..0a160a49 100644
--- a/base_user_role/models/user.py
+++ b/base_user_role/models/user.py
@@ -44,8 +44,9 @@ class ResUsers(models.Model):
                 lambda rec: rec.is_enabled)
             for role_line in role_lines:
                 role = role_line.role_id
-                group_ids.append(role.group_id.id)
-                group_ids.extend(role.implied_ids.ids)
+                if role:
+                    group_ids.append(role.group_id.id)
+                    group_ids.extend(role.implied_ids.ids)
             group_ids = list(set(group_ids))    # Remove duplicates IDs
             vals = {
                 'groups_id': [(6, 0, group_ids)],
diff --git a/base_user_role/views/user.xml b/base_user_role/views/user.xml
index d8da7791..4319940e 100644
--- a/base_user_role/views/user.xml
+++ b/base_user_role/views/user.xml
@@ -12,7 +12,7 @@
             <page string="Roles">
                 <field name="role_line_ids" nolabel="1">
                     <tree editable="bottom" colors="grey: not is_enabled;">
-                        <field name="role_id"/>
+                        <field name="role_id" required="1"/>
                         <field name="date_from"/>
                         <field name="date_to"/>
                         <field name="is_enabled"/>