Popped Spoke

I started to hear the "cling-cling" sound coming from the rear maybe around lap 7 . I couldn't figure it out until Sunday when I was cleaning the bike. A spoke was popped out! That was only the second ride on the wheelset, I'm under 150lb, and didn't even jump anything. The lack of robustness got me a little worried. I would certainly hate to see it happen again in the middle of SM100...