[15:52:47 WARN]: [OnTime] Task #22 for OnTime v4.1.1 generated an exception
java.util.ConcurrentModificationException
        at java.util.HashMap$HashIterator.nextEntry(HashMap.java:839) ~[?:1.7.0_71]
        at java.util.HashMap$KeyIterator.next(HashMap.java:874) ~[?:1.7.0_71]
        at me.edge209.OnTime.PlayerEventListener.auditLogout(PlayerEventListener.java:684) ~[?:?]
        at me.edge209.OnTime.OnTime.auditLogout(OnTime.java:525) ~[?:?]
        at me.edge209.OnTime.OnTime$5.run(OnTime.java:477) ~[?:?]
        at org.bukkit.craftbukkit.v1_7_R4.scheduler.CraftTask.run(CraftTask.java:71) ~[spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at org.bukkit.craftbukkit.v1_7_R4.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350) [spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:641) [spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:289) [spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:584) [spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:490) [spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
        at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [spigot.jar:git-Spigot-1.7.9-R0.2-205-g0a049fa]
[15:53:53 WARN]: Exception in thread "Craft Scheduler Thread - 9"
[15:53:53 WARN]: org.apache.commons.lang.UnhandledException: Plugin OnTime v4.1.1 generated an exception while executing task 53
        at org.bukkit.craftbukkit.v1_7_R4.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
        at me.edge209.OnTime.DataIO.buildUpdatePlayerQuery(DataIO.java:2421)
        at me.edge209.OnTime.DataIO.savePlayerDataMySQL(DataIO.java:2239)
        at me.edge209.OnTime.Import.updateUUID(Import.java:856)
        at me.edge209.OnTime.Import$updateUUIDevent.run(Import.java:568)
        at org.bukkit.craftbukkit.v1_7_R4.scheduler.CraftTask.run(CraftTask.java:71)
        at org.bukkit.craftbukkit.v1_7_R4.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
        ... 3 more