Find product => buggy

#include <iostream>

int findProductArray(int arr[], int n);
int findProductArrayRecursive(int arr[], int n, int i);
using namespace std;

int main() {
    int arr[] = {1, 3, 4, 5};
    cout << findProductArray(arr, 6);
    return 0;
}

int findProductArray(int arr[], int n) {
    return findProductArrayRecursive(arr, n, 0);
}

int findProductArrayRecursive(int arr[], int n, int i) {
    if (i == n) {
        return 1;
    } else {
        int currentIndex = i;
        return arr[currentIndex] * findProductArrayRecursive(arr, n, i+1);
    }
}