It seems like $periodEndAt can also be of type null; however, parameter $end of DatePeriod::__construct() does only seem to accept DateTimeInterface, 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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/** @scrutinizer ignore-type */ $periodEndAt
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));
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// When having count option, return only amount of recurrences requested