[Crash] Editing Settings due to SoundFilters

[Arouka]

Description: Unexpected error

java.lang.NullPointerException: Unexpected error
at paulscode.sound.libraries.ChannelLWJGLOpenAL.playing(ChannelLWJGLOpenAL.java:651)
at paulscode.sound.Source.playing(Source.java:1213)
at com.tmtravlr.soundfilters.SoundTickHandler.tickStart(SoundTickHandler.java:109)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_337_SoundTickHandler_tickStart_ClientTickEvent.invoke(.dynamic)
at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:51)
at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:122)
at cpw.mods.fml.common.FMLCommonHandler.onPostClientTick(FMLCommonHandler.java:329)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:2053)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:962)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:887)
at net.minecraft.client.main.Main.main(SourceFile:148)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:134)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

Happened when attempting to edit Antisotropic Filtering or Mipmap Levels in Settings