Which branch version to use with PHP 8.0 - 8.5?

I cannot get the latest question2answer 1.8.8 to run. Errors from `@$nonexsiting` seems not to be suppressed anymore.

Having PHP 8 enabled gives me:

> Error : Undefined array key "filter"
> File: /qa-include/qa-base.php
> Line: 545
> Source: $previous = @$qa_modules[$type][$name];

Is there a branch that has all PHP 8 issues fixed?