심각: L1UltimateBattle[]Error

java.lang.ArrayIndexOutOfBoundsException: 1

        at l1j.server.server.model.L1UltimateBattle$UbThread.waitForNextRound(L1UltimateBattle.java:388)

        at l1j.server.server.model.L1UltimateBattle$UbThread.run(L1UltimateBattle.java:434)

        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

        at java.lang.Thread.run(Unknown Source)

고수님들 이건왜그런가요 알려주심 감사하겠습니다