It seems like $this->message can also be of type null; however, parameter $message of Falseclock\Service\Valid...torError::__construct() does only seem to accept string, maybe add an additional type check?
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Ignorable by Annotation
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If this is a false-positive, you can also ignore this issue in your code via the ignore-type annotation
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return new ValidatorError(/** @scrutinizer ignore-type */ $this->message, $this->value);