Steps to reproduce the issue

Use joomla updater on a clean install of 3.4 to upgrade to 3.4rc1

Expected result

successful update

Actual result

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'admin://components/com_admin/postinstall/languageaccess340.php', 'admin_postinst' at line 2 SQL=INSERT INTO zg5mu_postinstall_messages (extension_id, title_key, description_key, action_key, language_extension, language_client_id, type, action_file, action, condition_file, condition_method, version_introduced, enabled) VALUES (700, 'COM_CPANEL_MSG_LANGUAGEACCESS340_TITLE', 'COM_CPANEL_MSG_LANGUAGEACCESS340_BODY', '', 'com_cpanel', 1, 'message', ', '', 'admin://components/com_admin/postinstall/languageaccess340.php', 'admin_postinstall_languageaccess340_condition', '3.4.1', 1);]

System information (as much as possible)

Additional comments