Index: trunk/admin/install.php
===================================================================
diff -u -r4790 -r4867
--- trunk/admin/install.php	(.../install.php)	(revision 4790)
+++ trunk/admin/install.php	(.../install.php)	(revision 4867)
@@ -598,7 +598,7 @@
 	    	$rs->MoveNext();
 	    }
 
-	    $sql = 'DELETE FROM '.$g_TablePrefix.'Cache WHERE VarName = "config_files"';
+	    $sql = 'DELETE FROM '.$g_TablePrefix.'Cache WHERE VarName IN ("config_files","configs_parsed")';
 		$ado->Execute($sql);
 
 		$include_file = $pathtoroot.$admin."/install/upgrade.php";
Index: trunk/core/kernel/session/session.php
===================================================================
diff -u -r4853 -r4867
--- trunk/core/kernel/session/session.php	(.../session.php)	(revision 4853)
+++ trunk/core/kernel/session/session.php	(.../session.php)	(revision 4867)
@@ -149,10 +149,11 @@
 	 *
 	 * @param Session $session
 	 * @param string $var_name
+	 * @param mixed $default
 	 */
-	function GetField(&$session, $var_name)
+	function GetField(&$session, $var_name, $default = false)
 	{
-		return $this->DirectVars[$var_name];
+		return isset($this->DirectVars[$var_name]) ? $this->DirectVars[$var_name] : $default;
 		//return $this->Conn->GetOne('SELECT '.$var_name.' FROM '.$this->TableName.' WHERE `'.$this->IDField.'` = '.$this->Conn->qstr($session->GetID()) );
 	}
 
@@ -731,9 +732,9 @@
 		return $this->StoreVar($name, $this->Storage->GetFromData($this, $name));
 	}
 
-	function GetField($var_name)
+	function GetField($var_name, $default = false)
 	{
-		return $this->Storage->GetField($this, $var_name);
+		return $this->Storage->GetField($this, $var_name, $default);
 	}
 
 	function SetField($var_name, $value)
Index: trunk/admin/install/install_lib.php
===================================================================
diff -u -r4524 -r4867
--- trunk/admin/install/install_lib.php	(.../install_lib.php)	(revision 4524)
+++ trunk/admin/install/install_lib.php	(.../install_lib.php)	(revision 4867)
@@ -1037,6 +1037,6 @@
 		
 		// create correct columns in ProductsCustomData table
 		$ml_helper =& $application->recallObject('kMultiLanguageHelper');
-		$ml_helper->createFields($prefix.'-cdata');
+		$ml_helper->createFields($prefix.'-cdata', true);
 	}
 ?>
Index: trunk/core/kernel/utility/unit_config_reader.php
===================================================================
diff -u -r4864 -r4867
--- trunk/core/kernel/utility/unit_config_reader.php	(.../unit_config_reader.php)	(revision 4864)
+++ trunk/core/kernel/utility/unit_config_reader.php	(.../unit_config_reader.php)	(revision 4867)
@@ -134,10 +134,9 @@
 
 		$this->includeConfigFiles($folderPath, $cache);
 		$this->ParseConfigs();
-
-		$this->CacheParsedData();
-
+		
 		if ($cache) {
+			$this->CacheParsedData();
 			$conn =& $this->Application->GetADODBConnection();
 			$conn->Query('REPLACE '.TABLE_PREFIX.'Cache (VarName, Data, Cached) VALUES ("config_files", '.$conn->qstr(serialize($this->configFiles)).', '.adodb_mktime().')');
 		}
@@ -410,7 +409,7 @@
 
 	function PreloadConfigFile($filename)
 	{
-		$config_found = file_exists(FULL_PATH.$filename) && ($this->configAllowed($filename) || defined('IS_INSTALL'));
+		$config_found = file_exists(FULL_PATH.$filename) && $this->configAllowed($filename);
 
 		if( defined('DEBUG_MODE') && DEBUG_MODE && constOn('DBG_PROFILE_INCLUDES') )
 		{
@@ -426,7 +425,7 @@
 		}
 		else
 		{
-			if($config_found) include_once(FULL_PATH.$filename);
+			if ($config_found) include_once(FULL_PATH.$filename);
 		}
 
 		if ($config_found) {
@@ -582,6 +581,11 @@
 		 */
 	function configAllowed($config_path)
 	{
+		if (defined('IS_INSTALL') && IS_INSTALL) {
+			// at installation start no modules in db and kernel configs could not be read
+			return true;
+		}
+		
 		$module_found = false;
 		if (!$this->Application->ModuleInfo) return false;