IncrementInt node suddenly blank inside

Hi,

Whilst working on a project I noticed something stopped working. I recreated it a few times but still nothing, I restarted UE4 and my machine.

After doing some digging around I decided to open the Increment Int node to reveal its contents was gone.

I have never opened the node before let alone deleted anything inside it.

Here’s what it looked like

and here’s what should be inside