Line 209 of Ha3SoundCommunicator can cause nextInt to have non-positive values

[Hurricaaane]

ModLoader: Mods loaded: 4
ModLoader 1.5.1
mod_TooManyItems 1.5.1 2012-03-23
mod_Audiotori r5 for 1.5.1
mod_MAtmos r23 for 1.5.1

java.lang.IllegalArgumentException: n must be positive
at java.util.Random.nextInt(Unknown Source)
at bkf.a(SoundPool.java:81)
at Ha3SoundCommunicator.playSound(Ha3SoundCommunicator.java:209)
at MAtSoundManagerMaster.playSound(MAtSoundManagerMaster.java:155)
at MAtSoundManagerChild.playSound(MAtSoundManagerChild.java:111)
at eu.ha3.matmos.engine.Event.playSound(Event.java:86)
at eu.ha3.matmos.engine.TimedEvent.routine(TimedEvent.java:70)
at eu.ha3.matmos.engine.Machine.routine(Machine.java:82)
at eu.ha3.matmos.engine.Knowledge.soundRoutine(Knowledge.java:756)
at eu.ha3.matmos.conv.Expansion.soundRoutine(Expansion.java:256)
at eu.ha3.matmos.conv.ExpansionManager.soundRoutine(ExpansionManager.java:173)
at MAtMod.onFrame(MAtMod.java:378)
at HaddonBridgeModLoader.onTickInGame(HaddonBridgeModLoader.java:184)
at ModLoader.onTick(ModLoader.java:980)
at EntityRendererProxy.b(EntityRendererProxy.java:21)
at net.minecraft.client.Minecraft.K(SourceFile:597)
at net.minecraft.client.Minecraft.run(SourceFile:526)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT 4a3114 ----------

[Hurricaaane]

Caused by the sound pool having a sound list entry for a certain sound but no actual sounds in the list
How?