diff --git a/htdocs/core/lib/security2.lib.php b/htdocs/core/lib/security2.lib.php
index 2cecbd606ca..3a71a1939b2 100644
--- a/htdocs/core/lib/security2.lib.php
+++ b/htdocs/core/lib/security2.lib.php
@@ -133,9 +133,6 @@ function dol_loginfunction($langs,$conf,$mysoc)
 	// Instantiate hooks of thirdparty module only if not already define
 	$hookmanager->initHooks(array('mainloginpage'));
 
-	$langcode=(GETPOST('lang')?((is_object($langs)&&$langs->defaultlang)?$langs->defaultlang:'auto'):GETPOST('lang'));
-	$langs->setDefaultLang($langcode);
-
 	$langs->load("main");
 	$langs->load("other");
 	$langs->load("help");
diff --git a/htdocs/main.inc.php b/htdocs/main.inc.php
index 8da9b1fd796..bc9cd14a938 100644
--- a/htdocs/main.inc.php
+++ b/htdocs/main.inc.php
@@ -388,13 +388,13 @@ if (! defined('NOLOGIN'))
         if ($dolibarr_main_authentication == 'forceuser' && ! empty($dolibarr_auto_user)) $goontestloop=true;
         if (GETPOST("username","alpha",2) || ! empty($_COOKIE['login_dolibarr']) || GETPOST('openid_mode','alpha',1)) $goontestloop=true;
 
-        $langcode=(GETPOST('lang')?((is_object($langs)&&$langs->defaultlang)?$langs->defaultlang:'auto'):GETPOST('lang'));
-        if (! is_object($langs)) // This can occurs when calling page with NOREQUIRETRAN defined, however we need lang for error messages.
+        if (! is_object($langs)) // This can occurs when calling page with NOREQUIRETRAN defined, however we need langs for error messages.
         {
             include_once DOL_DOCUMENT_ROOT.'/core/class/translate.class.php';
             $langs=new Translate("",$conf);
+    		$langcode=(GETPOST('lang')?GETPOST('lang','alpha',1):(empty($conf->global->MAIN_LANG_DEFAULT)?'auto':$conf->global->MAIN_LANG_DEFAULT));
+        	$langs->setDefaultLang($langcode);
         }
-        $langs->setDefaultLang($langcode);
 
         if ($test && $goontestloop)
         {
@@ -677,10 +677,10 @@ if (! defined('NOREQUIRETRAN'))
             }
         }
     }
-    else	// If language was forced on URL
+/*    else	// If language was forced on URL
     {
         $langs->setDefaultLang(GETPOST('lang','alpha',1));
-    }
+    }*/
 }
 
 // Case forcing style from url
diff --git a/htdocs/master.inc.php b/htdocs/master.inc.php
index b62ee1c9371..f24dcca7a67 100644
--- a/htdocs/master.inc.php
+++ b/htdocs/master.inc.php
@@ -201,10 +201,11 @@ if (! defined('NOREQUIREDB') && ! defined('NOREQUIRESOC'))
 }
 
 
-// Set default language (must be after the setValues of $conf)
+// Set default language (must be after the setValues setting global $conf->global->MAIN_LANG_DEFAULT. Page main.inc.php will overwrite langs->defaultlang with user value later)
 if (! defined('NOREQUIRETRAN'))
 {
-	$langs->setDefaultLang((! empty($conf->global->MAIN_LANG_DEFAULT)?$conf->global->MAIN_LANG_DEFAULT:''));
+    $langcode=(GETPOST('lang')?GETPOST('lang','alpha',1):(empty($conf->global->MAIN_LANG_DEFAULT)?'auto':$conf->global->MAIN_LANG_DEFAULT));
+	$langs->setDefaultLang($langcode);
 }