ISPConfig Update problem

Hi All, I have an issue running update.php. Here's the output:

php -q update.php


--------------------------------------------------------------------------------
_____ ___________ _____ __ _ ____
|_ _/ ___| ___ \ / __ \ / _(_) /__ \
| | \ `--.| |_/ / | / \/ ___ _ __ | |_ _ __ _ _/ /
| | `--. \ __/ | | / _ \| '_ \| _| |/ _` | |_ |
_| |_/\__/ / | | \__/\ (_) | | | | | | | (_| | ___\ \
\___/\____/\_| \____/\___/|_| |_|_| |_|\__, | \____/
__/ |
|___/
--------------------------------------------------------------------------------


>> Update

Operating System: Ubuntu 18.04.3 LTS UNKNOWN

This application will update ISPConfig 3 on your server.

Shall the script create a ISPConfig backup in /var/backup/ now? (yes,no) [yes]: yes

Creating backup of "/usr/local/ispconfig" directory...
Creating backup of "/etc" directory...
PHP Warning: Declaration of db::query($sQuery = '') should be compatible with mysqli::query($query, $resultmode = NULL) in /tmp/ispconfig3_install/install/lib/mysql.lib.php on line 754
Checking ISPConfig database .. OK
PHP Warning: Illegal string offset 'global' in /tmp/ispconfig3_install/install/lib/install.lib.php on line 631
PHP Fatal error: Uncaught Error: Cannot use string offset as an array in /tmp/ispconfig3_install/install/lib/install.lib.php:631
Stack trace:
#0 /tmp/ispconfig3_install/install/lib/update.lib.php(137): ini_to_array('[global]\nwebser...')
#1 /tmp/ispconfig3_install/install/update.php(288): updateDbAndIni()
#2 {main}
thrown in /tmp/ispconfig3_install/install/lib/install.lib.php on line 631
root@www:/tmp/ispconfig3_install/install#

Any ideas on how to solve this?

Thanks