Admob Native ad is stealing an item

So after I've implemented the NativeAds, only 3 days after I've noticed that my random method of displaying the ad is stealing one item from the json.

So, currenlty I'm displaying the ads every 13 items

if (index % 13 == 0)
            return adsContainer();

So this is stealing my 0 of json.

What could I do to stop this?

Solution 1: esqew

As you found out, 0 mod 13 == 0. In fact, 0 mod most all integers is 0.

Why not just work around this by checking to make sure the index isn't 0 before checking if index % 13 == 0?

if (index != 0 && index % 13 == 0) // make sure ad container is only displayed when we're not on index 0 and on every thirteenth element thereafter
    return adsContainer();