--- a/network_server.c	Mon Aug 20 15:17:24 2007 +0000
+++ b/network_server.c	Thu Aug 30 19:21:12 2007 +0000
@@ -823,6 +823,11 @@
 		return false;
 	}
 
+	if ((cp->cmd != CMD_PLAYER_CTRL && !IsValidPlayer(cp->player) && ci->client_index != NETWORK_SERVER_INDEX) {
+		IConsolePrintF(_icolour_err, "WARNING: spectator issueing command from client %d (IP: %s), kicking...", ci->client_index, GetPlayerIP(ci));
+		return false;
+	}
+
 	return true;
 }