passing 2 functions to useEffect and getting an error "Can't perform a React state update on an unmounted component."

Question

I need to pass 2 functions to my useEffect -

1. one that renders the whole page and sends some general data to the server,
2. another one is voting function and sends vote results (called "answer") to the server.

I tried to put both functions inside one useEffect, as well as using useEffect twice. Will show code for both of them.

2 useEffects was working for a little bit, then I started getting this error: "Can't perform a React state update on an unmounted component. This is a no-op, but it indicates a memory leak in your application. To fix, cancel all subscriptions and asynchronous tasks in a useEffect cleanup function".

So, my question is:

1. Can I call 2 functions under one useEffect or can I have 2 useEffects?
2. How to get rid of my unmount error? I tried setting isMounted to true/false but still no luck.

Code for both functions in one useEffect:

useEffect(() => {
        let isMounted = true;
        function viewingPoll() {
            fetch(`/api/polls/${pollIview}`)
                .then((resp) => resp.json())
                .then((result) => {
                    if (isMounted) {
                        console.log("my result on pollvoter is", result);
                        if (result.noSuchPoll) {
                            setPoll(false);
                        } else {
                            setPoll(result.pollInfo);
                            console.log("result right here", result); //all the happy points
                        }
                    }
                })
                .catch((err) => {
                    console.log("error in pollvoter.js ", err);
                    this.setState({
                        error: true,
                    });
                });
        }
        viewingPoll();
        function voting() {
            let isMounted = true;
            fetch("/api/vote", {
                method: "POST",
                headers: {
                    "Content-Type": "application/json",
                },
                body: JSON.stringify({
                    poll_id: poll.id,
                    answer: answer,
                }).then(() => {
                    if (isMounted) {
                        // location.redirect(`/polls/${result.pollId}`);
                        location.reload();
                    }
                }),
            });
        }
        voting();
        return () => {
            isMounted = false;
        };
 }, [answer]);

Example 2: having 2 separate useEffects

 useEffect(() => {
        let isMounted = true;
        function viewingPoll() {
            fetch(`/api/polls/${pollIview}`)
                .then((resp) => resp.json())
                .then((result) => {
                    if (isMounted) {
                        console.log("my result on pollvoter is", result);
                        if (result.noSuchPoll) {
                            setPoll(false);
                        } else {
                            setPoll(result.pollInfo);
                            console.log("result right here", result); //all the happy points
                        }
                    }
                })
                .catch((err) => {
                    console.log("error in pollvoter.js ", err);
                    this.setState({
                        error: true,
                    });
                });
        }
        viewingPoll();
}, [answer]);


useEffect(() => {
        let isMounted = true;
        fetch("/api/vote", {
            method: "POST",
            headers: {
                "Content-Type": "application/json",
            },
            body: JSON.stringify({
                poll_id: poll.id,
                answer: answer,
            }).then(() => {
                if (isMounted) {
                    // location.redirect(`/polls/${result.pollId}`);
                    location.reload();
                }
            }),
        });
        return () => {
            isMounted = false;
        };
    }, [answer]);