ActionScript 3.0 :: Overlapping Sounds - Boolean Does Not Work

Nov 5, 2010

I want to trigger a sound from my Library (linkage is: INM_Alarm). I have a problem with the code below. When I click the button a second time the sound should stop, but I get an error like this:
TypeError: Error #1009: Cannot access a property or method of a null object reference. at M_fla::MainTimeline/alarmFunction()[M_fla.MainTimeline::frame1:48]

Code:
alarm_btn.addEventListener(MouseEvent.CLICK, alarmFunction);
var sndAlarm:SoundChannel;
var alarmPlaying:Boolean = true;
function alarmFunction(evt:MouseEvent):void{
if(alarmPlaying){
var sndAlarm:INM_Alarm= new INM_Alarm();
sndAlarm.play();
[Code] ......

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