Index: branches/5.2.x/core/install.php
===================================================================
diff -u -N -r16796 -r16797
--- branches/5.2.x/core/install.php	(.../install.php)	(revision 16796)
+++ branches/5.2.x/core/install.php	(.../install.php)	(revision 16797)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: install.php 16796 2024-08-01 08:03:58Z alex $
+* @version	$Id: install.php 16797 2024-08-16 08:27:01Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -392,6 +392,29 @@
 						$this->Conn->Query('RENAME TABLE ' . TABLE_PREFIX . 'SessionData TO ' . TABLE_PREFIX . 'UserSessionData');
 					}
 
+					$sessions_table_structure = $this->Conn->Query('DESCRIBE ' . TABLE_PREFIX . 'UserSessions', 'Field');
+
+					if ( !array_key_exists('SessionId', $sessions_table_structure) ) {
+						// Update to 5.2.2-B3 -> add missing columns before creating sessions.
+						$this->Conn->Query('ALTER TABLE ' . TABLE_PREFIX . 'UserSessions DROP INDEX `PRIMARY`');
+						$this->Conn->Query(
+							'ALTER TABLE ' . TABLE_PREFIX . 'UserSessions
+								ADD `SessionId` int NOT NULL AUTO_INCREMENT PRIMARY KEY FIRST'
+						);
+						$this->Conn->Query(
+							'ALTER TABLE ' . TABLE_PREFIX . 'UserSessions 
+								CHANGE `SessionKey` `SessionKey` char(64) NOT NULL DEFAULT ""'
+						);
+						$this->Conn->Query(
+							'ALTER TABLE ' . TABLE_PREFIX . 'UserSessions 
+								ADD UNIQUE INDEX `SessionKey` (`SessionKey`) USING BTREE'
+						);
+						$this->Conn->Query(
+							'ALTER TABLE ' . TABLE_PREFIX . 'UserSessionData 
+								CHANGE `SessionKey` `SessionId` int unsigned NOT NULL DEFAULT "0"'
+						);
+					}
+
 					$next_preset = $this->Application->GetVar('next_preset');
 					if ($next_preset !== false) {
 						/** @var UserHelper $user_helper */