java.lang.ArrayIndexOutOfBoundsException: -1
        at net.sf.l2j.gameserver.skills.Formulas.calcFestivalRegenModifier(Formu
las.java:801)
        at net.sf.l2j.gameserver.skills.Formulas.calcHpRegen(Formulas.java:748)
        at net.sf.l2j.gameserver.model.L2Character$RegenTask.run(L2Character.jav
a:265)
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
        at java.util.concurrent.FutureTask$Sync.innerRunAndReset(Unknown Source)

        at java.util.concurrent.FutureTask.runAndReset(Unknown Source)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.
access$101(Unknown Source)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.
runPeriodic(Unknown Source)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.
run(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source
)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)