Bukkit

What steps will reproduce the problem?
1. run statistics
2. let player log on - happens not always
3.

What is the expected output? What do you see instead?
i see:

[14:45:59] [Craft Scheduler Thread - 47/WARN]: Exception in thread "Craft Scheduler Thread - 47"
[14:45:59] [Craft Scheduler Thread - 47/WARN]: org.apache.commons.lang.UnhandledException: Plugin Statistics v1.2.3 generated an exception while executing task 312
        at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
        at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.NullPointerException
        at java.util.LinkedList$ListItr.next(LinkedList.java:891)
        at com.google.common.collect.Iterators$9.next(Iterators.java:939)
        at com.google.common.collect.Iterators.addAll(Iterators.java:357)
        at com.google.common.collect.Lists.newArrayList(Lists.java:147)
        at net.minecraft.server.v1_8_R1.UserCache.a(UserCache.java:213)
        at net.minecraft.server.v1_8_R1.UserCache.c(UserCache.java:194)
        at net.minecraft.server.v1_8_R1.UserCache.getProfile(UserCache.java:123)
        at org.bukkit.craftbukkit.v1_8_R1.CraftProfileBanList.isBanned(CraftProfileBanList.java:81)
        at org.bukkit.craftbukkit.v1_8_R1.entity.CraftPlayer.isBanned(CraftPlayer.java:721)
        at com.wolvencraft.yasp.db.data.players.MiscInfoPlayerEntry.<init>(MiscInfoPlayerEntry.java:62)
        at com.wolvencraft.yasp.db.data.players.PlayersData.<init>(PlayersData.java:57)
        at com.wolvencraft.yasp.session.OnlineSession$1.run(OnlineSession.java:105)
        at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftTask.run(CraftTask.java:71)
        at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
        ... 3 more

What version of the product are you using?
1.2.3

Do you have an error log of what happened? (Portal: check cache/error.txt)

Please provide any additional information below. (Plugin/Portal Version, Server Version, PHP Version. MySQL Version)

Which build are you using 1.2.3 #xxx?