It seems like $this->promise->__resolve() can also be of type null; however, parameter $elements of Doctrine\Common\Collecti...llection::__construct() does only seem to accept array, maybe add an additional type check?
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Ignorable by Annotation
)
If this is a false-positive, you can also ignore this issue in your code via the ignore-type annotation
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$this->collection = new ArrayCollection(/** @scrutinizer ignore-type */ $this->promise->__resolve());