There is a spot behind mid turret where you can not be targeted by basic attacks

So I was running around mid turret with fizz and I managed to get behind the turret. When I did I realized I could no longer click on myself at all. I would pull the cursor over myself to highlight myself, and it would not highlight me but the turret. All you have to do is stand between the turret and the wall where you can no longer see yourself, and you can not be targeted.