diff --git a/base_user_role/models/user.py b/base_user_role/models/user.py
index 30f807116..0a160a495 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 d8da77915..4319940e9 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"/>