Index: branches/RC/core/kernel/session/session.php
===================================================================
diff -u -r11711 -r11828
--- branches/RC/core/kernel/session/session.php	(.../session.php)	(revision 11711)
+++ branches/RC/core/kernel/session/session.php	(.../session.php)	(revision 11828)
@@ -96,11 +96,14 @@
 		if (defined('IS_INSTALL') && IS_INSTALL && !$this->Application->TableFound($this->TableName)) {
 			return false;
 		}
-		$fields_hash = 	Array (
-								$this->IDField			=>	$session->SID,
-								$this->TimestampField	=>	$session->Expiration
-						);
 
+		$fields_hash = Array (
+			$this->IDField			=>	$session->SID,
+			$this->TimestampField	=>	$session->Expiration
+		);
+
+		$fields_hash = array_merge($fields_hash, $additional_fields);
+
 		$this->Conn->doInsert($fields_hash, $this->TableName);
 
 		foreach ($additional_fields as $field_name => $field_value) {