20:57:19 [SEVERE] Could not pass event FurnaceSmeltEvent to SalvageSmelter v0.0.5
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.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:26)
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:479)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:464)
        at net.minecraft.server.v1_5_R2.TileEntityFurnace.burn(TileEntityFurnace.java:261)
        at net.minecraft.server.v1_5_R2.TileEntityFurnace.h(TileEntityFurnace.java:177)
        at net.minecraft.server.v1_5_R2.World.tickEntities(World.java:1355)
        at net.minecraft.server.v1_5_R2.WorldServer.tickEntities(WorldServer.java:512)
        at net.minecraft.server.v1_5_R2.MinecraftServer.r(MinecraftServer.java:561)
        at net.minecraft.server.v1_5_R2.DedicatedServer.r(DedicatedServer.java:223)
        at net.minecraft.server.v1_5_R2.MinecraftServer.q(MinecraftServer.java:471)
        at net.minecraft.server.v1_5_R2.MinecraftServer.run(MinecraftServer.java:403)
        at net.minecraft.server.v1_5_R2.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.NullPointerException
        at com.norcode.bukkit.salvagesmelter.SalvageSmelter.getSalvage(SalvageSmelter.java:181)
        at com.norcode.bukkit.salvagesmelter.SalvageSmelter.onSmelt(SalvageSmelter.java:137)
        at sun.reflect.GeneratedMethodAccessor253.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
        ... 13 more