[21:41:06] [Craft Scheduler Thread - 25357/OSTRZEŻENIE]: Exception in thread "Craft Scheduler Thread - 25357" 
[21:41:06] [Craft Scheduler Thread - 25357/OSTRZEŻENIE]: org.apache.commons.lang.UnhandledException: Plugin FGDiscoArmor v1.0 generated an exception while executing task 43
at org.bukkit.craftbukkit.v1_7_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.lang.IllegalArgumentException: Cannot measure distance between world and xvsx
at org.bukkit.Location.distanceSquared(Location.java:448)
at org.bukkit.Location.distance(Location.java:431)
at pl.fgstef.disco.ArmorTask.run(ArmorTask.java:113)
at org.bukkit.craftbukkit.v1_7_R1.scheduler.CraftTask.run(CraftTask.java:58)
at org.bukkit.craftbukkit.v1_7_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
... 3 more