Parse error…

Hello. After updating to the latest version of the plugin I get the error:

Parse error: syntax error, unexpected ‘[‘ in …………plugins/ose-firewall/classes/Library/multisites/mainwp.php on line 156

What it is caused and how to fix it?

I went back for the time being to version 4.3.0

Please help and thank you.

https://wordpress.org/plugins/ose-firewall/