Fix: Avoid warning

htdocs/user/class/user.class.php

@@ -1725,7 +1725,7 @@ class User extends CommonObject
 		}
 
 		// If order not defined, we use the setup
-		if ($nameorder < 0) $nameorder=(! $conf->global->MAIN_FIRSTNAME_NAME_POSITION);
+		if ($nameorder < 0) $nameorder=empty($conf->global->MAIN_FIRSTNAME_NAME_POSITION)?1:0;
 
 		if ($nameorder)
 		{