12:59:16 [SEVERE] Could not pass event BlockRedstoneEvent to Lift v32
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 net.minecraft.server.v1_4_6.BlockButton.interact(BlockButton.java:153)
at net.minecraft.server.v1_4_6.PlayerInteractManager.interact(PlayerInteractManager.java:385)
at net.minecraft.server.v1_4_6.PlayerConnection.a(PlayerConnection.java:656)
at net.minecraft.server.v1_4_6.Packet15Place.handle(SourceFile:58)
at net.minecraft.server.v1_4_6.NetworkManager.b(NetworkManager.java:290)
at net.minecraft.server.v1_4_6.PlayerConnection.d(PlayerConnection.java:112)
at net.minecraft.server.v1_4_6.ServerConnection.b(SourceFile:39)
at net.minecraft.server.v1_4_6.DedicatedServerConnection.b(SourceFile:30)
at net.minecraft.server.v1_4_6.MinecraftServer.r(MinecraftServer.java:585)
at net.minecraft.server.v1_4_6.DedicatedServer.r(DedicatedServer.java:224)
at net.minecraft.server.v1_4_6.MinecraftServer.q(MinecraftServer.java:481)
at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:416)
at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:849)
Caused by: java.lang.NullPointerException
at net.croxis.plugins.lift.LiftRedstoneListener.onBlockRedstoneChange(LiftRedstoneListener.java:135)
at sun.reflect.GeneratedMethodAccessor316.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
... 16 more

See if this happens in lift 33