Crashing on first launch

[Fel-lek]

Every time I create a new build, creating a socket or connecting to a socket (using SteamNetworkingSockets.CreateRelaySocket and SteamNetworkingSockets.ConnectRelay respectively) both cause a crash. Once I relaunch and try the exact same thing again, it works perfectly fine. Any ideas?

No crash file is created, so I'm not sure what other info I can give.