2013-09-27 17:41:15 [SEVERE] Could not pass event ArtificialBlockPlaceEvent to RedstoneSensor v2.0.0
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
    at me.lyneira.MachinaCore.EventSimulator.blockPlacePretend(EventSimulator.java:112)
    at me.lyneira.MachinaCore.Movable.canMove(Movable.java:325)
    at me.lyneira.MachinaDrill.Drill.doMove(Drill.java:232)
    at me.lyneira.MachinaDrill.Drill.heartBeat(Drill.java:154)
    at me.lyneira.MachinaCore.MachinaRunner.run(MachinaRunner.java:56)
    at org.bukkit.craftbukkit.v1_6_R3.scheduler.CraftTask.run(CraftTask.java:53)
    at org.bukkit.craftbukkit.v1_6_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:345)
    at net.minecraft.server.v1_6_R3.MinecraftServer.t(MinecraftServer.java:524)
    at net.minecraft.server.v1_6_R3.DedicatedServer.t(DedicatedServer.java:227)
    at net.minecraft.server.v1_6_R3.MinecraftServer.s(MinecraftServer.java:488)
    at net.minecraft.server.v1_6_R3.MinecraftServer.run(MinecraftServer.java:421)
    at net.minecraft.server.v1_6_R3.ThreadServerApplication.run(SourceFile:583)
Caused by: java.lang.NullPointerException
    at com.ugleh.redstonesensor.RedstoneSensorListener.BlockCreated(RedstoneSensorListener.java:50)
    at sun.reflect.GeneratedMethodAccessor187.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
    ... 15 more