It seems like $param can also be of type null; however, parameter $name of Psr\Http\Message\MessageInterface::hasHeader() does only seem to accept string, maybe add an additional type check?
(
Ignorable by Annotation
)
If this is a false-positive, you can also ignore this issue in your code via the ignore-type annotation
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if (!$request->hasHeader(/** @scrutinizer ignore-type */ $param)) {
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return new RejectedPromise('header \'' . $param . '\' is missing');