NaN for $Jset in getSunTimes

[J4nsen]

Hi, I'm getting a NaN for $Jset in getSunTimes for night/nightEnd.
Location $sc = new SunCalc(new DateTime(), 53, 9);

Thanks again for this library!
Jan

PHP 7.1.4 (cli) (built: Apr 25 2017 09:48:36) ( NTS )