How can I use async function in hardwareBackPress listener?

Question

I made an application that can make agora voice calls with React native. When clicking leave on the screen, the below agoraEnd function works correctly. I also want this function to work when the phone's back button is pressed. That's why I prepared the useFocusEffet below. But when I press the back button during a voice call, I get the following error. Why is this function not working correctly? How can I fix this problem.

Possible Unhandled Promise Rejection (id: 2): TypeError: engine.leaveChannel is not a function. (In 'engine.leaveChannel()', 'engine.leaveChannel' is undefined)

  const agoraEnd = async () => {
    await engine.leaveChannel()
    await engine.destroy()
    navigation.goBack();
  };

  useFocusEffect(
    useCallback(() => {
      const backHandler = BackHandler.addEventListener(
        'hardwareBackPress',
        agoraEnd,
      );
      return () => backHandler.remove();
    }, []),
  )