[12:36:14 WARN]: Exception in thread "Craft Scheduler Thread - 2"
[12:36:14 WARN]: org.apache.commons.lang.UnhandledException: Plugin Stats v2.0.1-272 generated an exception while executing task 67
        at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
        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:745)
Caused by: java.lang.NullPointerException
        at nl.lolmewn.stats.player.UUIDPlayerManager.findPlayer(UUIDPlayerManager.java:91)
        at nl.lolmewn.stats.signs.SignDataGetter.run(SignDataGetter.java:57)
        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


[12:36:23 WARN]: Exception in thread "Craft Scheduler Thread - 20"
[12:36:23 WARN]: org.apache.commons.lang.UnhandledException: Plugin Stats v2.0.1-272 generated an exception while executing task 67
        at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
        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:745)
Caused by: java.lang.NullPointerException
        at nl.lolmewn.stats.player.UUIDPlayerManager.findPlayer(UUIDPlayerManager.java:91)
        at nl.lolmewn.stats.signs.SignDataGetter.run(SignDataGetter.java:57)
        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


[12:36:33 WARN]: Exception in thread "Craft Scheduler Thread - 24"
[12:36:33 WARN]: org.apache.commons.lang.UnhandledException: Plugin Stats v2.0.1-272 generated an exception while executing task 229
        at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
        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:745)
Caused by: java.lang.IllegalArgumentException: Name cannot be null
        at org.apache.commons.lang.Validate.notNull(Validate.java:192)
        at org.bukkit.craftbukkit.v1_8_R1.CraftServer.getPlayerExact(CraftServer.java:422)
        at nl.lolmewn.stats.player.UUIDPlayerManager$1.run(UUIDPlayerManager.java:174)
        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