Why do I have a sphere in my scene on playing?

Hi, not sure if this is a bug or simply something that I have done to cause this.

On playing the game and moving the cylinder shape with the F key a sphere has been residing underneath it, it stays at the origin of the pawn location and doesnt move when I press F, my question is, why is it there?

http://www.robertramsay.co.uk/ue4/strangeSphere.jpg

I added a player start object and it has resolved the problem of the unwanted sphere :slight_smile: