It seems like $environment can also be of type null; however, parameter $environment of AbterPhp\Framework\Http\...Security::__construct() does only seem to accept string, maybe add an additional type check?
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Ignorable by Annotation
)
If this is a false-positive, you can also ignore this issue in your code via the ignore-type annotation
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$security = new Security($cacheBridge, /** @scrutinizer ignore-type */ $environment);