diff --git a/htdocs/install/etape2.php b/htdocs/install/etape2.php
index 4f508a8ffaa..68a0274ec9e 100644
--- a/htdocs/install/etape2.php
+++ b/htdocs/install/etape2.php
@@ -39,8 +39,10 @@ $langs->defaultlang=$setuplang;
 $langs->load("admin");
 $langs->load("install");
 
+
 pHeader($langs->trans("CreateDatabaseObjects"),"etape4");
 
+$grant_query='';
 $etape = 2;
 
 if (file_exists($conffile))
@@ -145,7 +147,7 @@ if ($_POST["action"] == "set")
                 }
                 else
                 {
-                    if ($db->errno() == DB_ERROR_TABLE_ALREADY_EXISTS)
+                    if ($db->errno() == 'DB_ERROR_TABLE_ALREADY_EXISTS')
                     {
                         //print "<td>Déjà existante</td></tr>";
                         $table_exists = 1;
@@ -217,7 +219,7 @@ if ($_POST["action"] == "set")
                         }
                         else
                         {
-                            if ($db->errno() == DB_ERROR_CANNOT_CREATE || eregi('duplicate key name',$db->error()))
+                            if ($db->errno() == 'DB_ERROR_CANNOT_CREATE' || eregi('duplicate key name',$db->error()))
                             {
                                 //print "<td>Déjà existante</td></tr>";
                                 $key_exists = 1;
@@ -253,7 +255,7 @@ if ($_POST["action"] == "set")
     if ($ok)
     {
         // Droits sur les tables
-        if ($grant_query) {
+        if ($grant_query) {     // Non null si postgresql
             if ($db->query($grant_query))
             {
                 print "<tr><td>Grant User</td><td>".$langs->trans("OK")."</td></tr>";
@@ -300,7 +302,7 @@ if ($_POST["action"] == "set")
                     }
                     else
                     {
-                        if ($db->errno() == DB_ERROR_RECORD_ALREADY_EXISTS)
+                        if ($db->errno() == 'DB_ERROR_RECORD_ALREADY_EXISTS')
                         {
                             // print "<tr><td>Insertion ligne : $buffer</td><td>
                         }
@@ -355,7 +357,7 @@ if ($_POST["action"] == "set")
                     }
                     else
                     {
-                        if ($db->errno() == DB_ERROR_RECORD_ALREADY_EXISTS)
+                        if ($db->errno() == 'DB_ERROR_RECORD_ALREADY_EXISTS')
                         {
                             // print "<tr><td>Insertion ligne : $buffer</td><td>
                         }
diff --git a/htdocs/install/etape4.php b/htdocs/install/etape4.php
index 4628e555a65..0a96b20a38c 100644
--- a/htdocs/install/etape4.php
+++ b/htdocs/install/etape4.php
@@ -54,7 +54,7 @@ require ($dolibarr_main_document_root . "/conf/conf.class.php");
 
 print '<table cellspacing="0" cellpadding="4" border="1" width="100%">';
 
-$error=0;
+$err=0;
 
 $conf = new Conf();
 $conf->db->type = $dolibarr_main_db_type;
@@ -76,24 +76,27 @@ if ($db->ok == 1)
   print '<input type="password" name="pass_verif"></td></tr>';
   print '</table>';
 
-  if ($_GET["error"] == 1)
+  if (isset($_GET["error"]) && $_GET["error"] == 1)
     {
       print '<div class="error">'.$langs->trans("PasswordsMismatch").'</div>';
     }
 
-  if ($_GET["error"] == 2)
+  if (isset($_GET["error"]) && $_GET["error"] == 2)
     {
       print '<div class="error">';
       print $langs->trans("PleaseTypePassword");
       print '</div>';
     }
 
-  if ($_GET["error"] == 3)
+  if (isset($_GET["error"]) && $_GET["error"] == 3)
     {
       print '<div class="error">'.$langs->trans("PleaseTypeALogin").'</div>';
     }
-  $db->close();
+
 }
 
+$db->close();
+
 pFooter($err);
+
 ?>
diff --git a/htdocs/install/fileconf.php b/htdocs/install/fileconf.php
index 957afa0e5d3..cfaeeabb954 100644
--- a/htdocs/install/fileconf.php
+++ b/htdocs/install/fileconf.php
@@ -33,6 +33,8 @@
 
 include_once("./inc.php");
 
+$err=0;
+
 $setuplang=isset($_POST["selectlang"])?$_POST["selectlang"]:(isset($_GET["selectlang"])?$_GET["selectlang"]:$langcode);
 $langs->defaultlang=$setuplang;
 $langs->load("install");