Problem/Bug Swapper/Sumo bug

The sumo plugin named swapper is a really easy setup good plugin, but i have 1 problem, when there is enough people in the lobby and the game counts down from 10 and starts it only teleports the first person that joined the lobby to the arena and the other people do not get teleoported and dont get sumo sticks and sometimes when you click the sign it says you joined the lobby but you dont and it gives you this error: http://pastebin.com/sNKYY6vF