diff --git a/htdocs/societe/class/societeaccount.class.php b/htdocs/societe/class/societeaccount.class.php
index 4b3fcc15ec1..41fc8633be1 100644
--- a/htdocs/societe/class/societeaccount.class.php
+++ b/htdocs/societe/class/societeaccount.class.php
@@ -79,7 +79,7 @@ class SocieteAccount extends CommonObject
 	public $fields = array(
 		'rowid' => array('type'=>'integer', 'label'=>'TechnicalID', 'visible'=>-2, 'enabled'=>1, 'position'=>1, 'notnull'=>1, 'index'=>1, 'comment'=>'Id',),
 		'entity' => array('type'=>'integer', 'label'=>'Entity', 'visible'=>0, 'enabled'=>1, 'position'=>5, 'default'=>1),
-		'login' => array('type'=>'varchar(64)', 'label'=>'Login', 'visible'=>1, 'enabled'=>1, 'position'=>10),
+		'login' => array('type'=>'varchar(64)', 'label'=>'Login', 'visible'=>1, 'enabled'=>1, 'notnull'=>1, 'position'=>10),
 		'pass_encoding' => array('type'=>'varchar(24)', 'label'=>'PassEncoding', 'visible'=>0, 'enabled'=>1, 'position'=>30),
 		'pass_crypted' => array('type'=>'varchar(128)', 'label'=>'Password', 'visible'=>1, 'enabled'=>1, 'position'=>31, 'notnull'=>1),
 		'pass_temp'    => array('type'=>'varchar(128)', 'label'=>'Temp', 'visible'=>0, 'enabled'=>0, 'position'=>32, 'notnull'=>-1,),