MultiInv Error

[11:44:13 WARN]: Exception in thread "Craft Scheduler Thread - 281"
[11:44:13 WARN]: org.apache.commons.lang.UnhandledException: Plugin MultiInv v3.3.2-dev generated an exception while executing task 410023
        at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:724)
Caused by: java.util.ConcurrentModificationException
        at java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:953)
        at java.util.LinkedList$ListItr.next(LinkedList.java:886)
        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.CraftServer.getOfflinePlayer(CraftServer.java:1288)
        at org.bukkit.Bukkit.getOfflinePlayer(Bukkit.java:741)
        at com.onarandombox.multiverseinventories.util.data.DefaultPlayerProfile.<init>(DefaultPlayerProfile.java:51)
        at com.onarandombox.multiverseinventories.util.data.FlatFilePlayerData.getPlayerData(FlatFilePlayerData.java:283)
        at com.onarandombox.multiverseinventories.WeakProfileContainer.getPlayerData(WeakProfileContainer.java:98)
        at uk.co.tggl.pluckerpluck.multiinv.command.MultiverseImportThread.run(MultiverseImportThread.java:134)
        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