Working fine but problem with event handler

[cell0901]

player.on('stateChange', (event) => {
    // event.data
});

while using event change when event.data === 0 basically the youtube player video ends to call a function but first time it works fine if i dont load the page or dont click anywhere else.

but while the video is playing and i click on other tab opened and came back to this tab the stateChange(i check logging the event.data) doesnt works and do whatever i told the function to do.