Strange sound error

[drpelz]

Hi,

sometimes I get this strange error during gameplay:

TypeError: Error #1009: Cannot access a property or method of a null object reference.
	at com.efg.framework_mod::SoundManager/playSound()[/Users/xxx/Documents/Developer/AS3_Flex/game_development/projects/xxx/SpaceGame/libs/src/com/efg/framework_mod/SoundManager.as:106]
	at com.xxx.games.spacegame::Main/soundEventListener()[/Users/xxx/Documents/Developer/AS3_Flex/game_development/projects/xxx/SpaceGame/src/com/xxx/games/spacegame/Main.as:1407]
	at flash.events::EventDispatcher/dispatchEventFunction()
	at flash.events::EventDispatcher/dispatchEvent()
	at com.xxx.games.spacegame::SpaceGame/createEnemyProj()[/Users/xxx/Documents/Developer/AS3_Flex/game_development/projects/xxx/SpaceGame/src/com/xxx/games/spacegame/SpaceGame.as:3708]

I still don't know what causes the error. The only thing I discovered is that sometimes an object is null inside of my SoundManager. But I don't know why. I already checked all appropriate arrays if something's missing there but all seems to be ok there. This is an extremely nasty bug which lasts for several weeks now. Please - I need your help to get rid of this error in order to finish my game. Thank you very much.

This is the part of the SoundManager where the error occurs:

	public function playSound(soundName:String, isSoundTrack:Boolean = false, loops:int = 1, offset:Number = 0, _volume:Number = 1, fadeIn:Boolean = false,
									_duration:Number = 1):void {
			
		
			
		tempSoundTransform.volume = _volume;
		
			
		tempSound = sounds[soundName];//sometimes null (still don't know why)
			
		if (!fadeIn) {
			if (isSoundTrack) {
				if (soundTrackChannel != null) {
					soundTrackChannel.stop();
				}
				soundTrackChannel = tempSound.play(offset, loops);								
				soundTrackChannel.soundTransform = tempSoundTransform;	
			} else {
				
					
				soundChannels[soundName] = tempSound.play(offset, loops);//sometimes null but still don't know why
			
				soundChannels[soundName].soundTransform = tempSoundTransform;//line 106 (see errors above)
					
							
			}
		} else {
				
			fadeInSoundTransform = new SoundTransform(0, 0);
			
			if (isSoundTrack) {
				if (soundTrackChannel != null) {
					soundTrackChannel.stop();
				}
				soundTrackChannel = tempSound.play(offset, loops, fadeInSoundTransform);
			} else {
				soundChannels[soundName] = tempSound.play(offset, loops, fadeInSoundTransform);
				
			}
				
			TweenLite.to(fadeInSoundTransform, _duration, {volume:_volume, onUpdate:updateFadeIn, onUpdateParams:[soundName, isSoundTrack]});
		}
	}

this is line 3708 (see errors above):

dispatchEvent(new CustomEventSound(CustomEventSound.PLAY_SOUND, enemyProjSounds[tempEnemyProj._type], false, 0, 8, setSoundVolume, false, false, 0));

This is the class CustomEventSound:

public function CustomEventSound(type:String, name:String, isSoundTrack:Boolean = false, loops:int = 0,
				offset:Number = 0, _volume:Number = 1, fadeIn:Boolean = false, fadeOut:Boolean = false,
			_duration:Number = 2, startVol:Number = 1, bubbles:Boolean = false, cancelable:Boolean = false)
	{
		super(type, bubbles, cancelable);
		this.name = name;
		this.loops = loops;
		this.offset = offset;
		this._volume = _volume;
		this.isSoundTrack = isSoundTrack;
		this.fadeIn = fadeIn;
		this.fadeOut = fadeOut;
		this._duration = _duration;
		this.startVol = startVol;
			
	}
		
	public override function clone():Event {
		return new CustomEventSound(type, name, isSoundTrack, loops, offset, _volume, fadeIn, fadeOut, _duration, startVol, bubbles, cancelable)
	}
		
		
	public override function toString():String {
		return formatToString(type, "type", "bubbles", "cancelable", "eventPhase", name, isSoundTrack, loops, offset, _volume, fadeIn,
					fadeOut, _duration, startVol);
	}

The Listener-function for CustomEventSounds-Events

override public function soundEventListener(e:CustomEventSound):void {
			
	if (e.type == CustomEventSound.PLAY_SOUND) {
			
	soundManager.playSound(e.name, e.isSoundTrack, e.loops, e.offset, e._volume, e.fadeIn, e._duration);
	} else {
		soundManager.stopSound(e.name, e.isSoundTrack, e.fadeOut, e._duration, e.startVol);
	}
}