PHP 7.4 - Array offset on value of type nul

[GOinfo-Ltd]

Problem

Trying to launch the latest installer (directly pulled from the "download" button on the main page) runs into :

This is a very well known error that was only a warning in php <= 7.3, but is now an error in 7.4+.

This will not make an error in PHP 7.3.

Technical Details

• Pagekit version: 1.0.18
• Webserver: n/d
• Database: n/d
• PHP Version: 7.4.7

[GOinfo-Ltd]

Manually updating Doctrine to their latest commit fixed this issue.

[yavuzkutuk]

composer update doctrine/annotations solved this problem

[rkrx]

This trick does not work for me anymore @ PHP 7.4.8 using latest download link.
Even latest git clone with composer update does not work.