[SEVERE] Could not pass event org.bukkit.event.inventory.FurnaceBurnEvent to CarbonEmissions
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$103.execute(JavaPluginLoader.java:1026)
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:61)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:460)
	at net.minecraft.server.TileEntityFurnace.l_(TileEntityFurnace.java:145)
	at net.minecraft.server.World.tickEntities(World.java:1177)
	at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:528)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:435)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:465)
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.bukkit.plugin.java.JavaPluginLoader$103.execute(JavaPluginLoader.java:1024)
	... 7 more
Caused by: java.lang.NullPointerException
	at me.cliff777.plugin.CarbonEmissions.FurnaceListener.onFurnaceSmelt(FurnaceListener.java:44)
	... 12 more