Prefetch Query error - Next.js

export const getServerSideProps: GetServerSideProps = async (ctx) => {
    await queryClient.prefetchQuery({
        queryKey: ["customers"],
        queryFn: getCustomers,
    });

    return {
        props: {
            dehydratedState: dehydrate(queryClient),
        }
    }
}

export const getServerSideProps: GetServerSideProps = async (ctx) => {
    await queryClient.prefetchQuery({
        queryKey: ["customers"],
        queryFn: getCustomers,
    });

    return {
        props: {
            dehydratedState: dehydrate(queryClient),
        }
    }
}