glist showall throws NullPointerException

[huluhulua]

10:34:26 [SEVERE] Task BungeeTask(sched=net.md_5.bungee.scheduler.BungeeScheduler@51c693d, id=16757, owner=com.imaginarycode.minecraft.redisbungee.RedisBungee@11d8ae8b, task=com.imaginarycode.minecraft.redisbungee.RedisBungeeCommands$GlistCommand$1@43aaf813, delay=0, period=0, running=true) encountered an exception java.lang.NullPointerException at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:770) at com.google.common.base.Joiner.toString(Joiner.java:454) at com.google.common.base.Joiner.appendTo(Joiner.java:106) at com.google.common.base.Joiner.appendTo(Joiner.java:154) at com.google.common.base.Joiner.join(Joiner.java:197) at com.google.common.base.Joiner.join(Joiner.java:187) at com.imaginarycode.minecraft.redisbungee.RedisBungeeCommands$GlistCommand$1.run(RedisBungeeCommands.java:72) at net.md_5.bungee.scheduler.BungeeTask.run(BungeeTask.java:63) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:748)
and it doesn't show player list of 3 of my servers.