diff --git a/htdocs/main.inc.php b/htdocs/main.inc.php
index 516c19b9c80..98fd94357f7 100644
--- a/htdocs/main.inc.php
+++ b/htdocs/main.inc.php
@@ -432,7 +432,7 @@ if (! defined('NOLOGIN'))
                 include_once DOL_DOCUMENT_ROOT.'/core/class/translate.class.php';
                 $langs=new Translate("",$conf);
             }
-            dol_loginfunction($langs,$conf,$mysoc);
+            dol_loginfunction($langs,$conf,(! empty($mysoc)?$mysoc:''));
             exit;
         }