diff --git a/htdocs/main.inc.php b/htdocs/main.inc.php
index 43f7c389eb9..845deda4590 100644
--- a/htdocs/main.inc.php
+++ b/htdocs/main.inc.php
@@ -23,7 +23,7 @@
  */
 define('DOL_VERSION','1.2.0-DEV');
 
-if (! @include_once("conf/conf.php"))
+if (! @include_once("conf/conf.php") or ! isset($dolibarr_main_db_host))
 {
   print "<center>\n";
   print "<b>Bienvenue sur Dolibarr</b><br><br>\n";