I've talked with another community about this on their server and we have it too. People are dropping dead and we're getting this in the logs...

"Shotgun Nelly(uid=76561198125284155) was KILLED by Shotgun Nelly(uid=76561198125284155)."
22:29:27 | "Shotgun Nelly(uid=76561198125284155) was KILLED by Error: No vehicle(uid=)."
22:29:27 | "The Darkhorse(uid=76561198055538809) was KILLED by Error: No vehicle(uid=)."

This is happening on one of my servers found here:
http://www.gametracker.com/server_info/216.155.143.82:2502/