How to access the currentIndex of a proGallery slideshow

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When I try to access the currentIndex of a proGallery slideshow I'm working with, the console log displays 'undefined'.  Any help much appreciated. I've pasted the code below.

$w.onReady(function () {

setTimeout(proGalleryCheck, 500);

});

function proGalleryCheck() {

$w("#gallery1").onCurrentItemChanged((event) => {

let currentIndex = $w(“#gallery1”).currentIndex; // 3
console.log(i)
console.log(currentIndex)

    i = i + 1

if (i == 5) {
i = 0

    }

//console.log(event.itemIndex)
});
}