diff --git a/addons/web/static/src/js/views/form_widgets.js b/addons/web/static/src/js/views/form_widgets.js
index 988a3f4d699..de98f633399 100644
--- a/addons/web/static/src/js/views/form_widgets.js
+++ b/addons/web/static/src/js/views/form_widgets.js
@@ -955,7 +955,8 @@ var FieldRadio = common.AbstractField.extend(common.ReinitializeFieldMixin, {
     },
     get_value: function () {
         var value = this.get('value');
-        return ((value instanceof Array)? value[0] : value) || false;
+        value = ((value instanceof Array)? value[0] : value);
+        return  _.isUndefined(value) ? false : value;
     },
     render_value: function () {
         var self = this;
diff --git a/odoo/fields.py b/odoo/fields.py
index 427b6c6aa02..2a73ca94daf 100644
--- a/odoo/fields.py
+++ b/odoo/fields.py
@@ -1744,6 +1744,14 @@ class Selection(Field):
                 return item[1]
         return False
 
+    def convert_to_column(self, value, record):
+        """ Convert ``value`` from the ``write`` format to the SQL format. """
+        if value is None or value is False:
+            return None
+        if isinstance(value, unicode):
+            return value.encode('utf8')
+        return str(value)
+
 
 class Reference(Selection):
     type = 'reference'