diff --git a/HelpSource/Classes/Spectrogram.schelp b/HelpSource/Classes/Spectrogram.schelp
index 6f18a32..aea95ef 100644
--- a/HelpSource/Classes/Spectrogram.schelp
+++ b/HelpSource/Classes/Spectrogram.schelp
@@ -42,11 +42,22 @@ Specify the range of frequencies you want to visualise.
 DISCUSSION::
 code::
 s.boot;
+
+(
 // the spectrogram in a window
 w = Window.new("testing spectrogram", Rect(10,10, 600, 300)).front;
-a = Spectrogram.new(w, Rect(10, 10, 580, 280));
-a.start;
-{Saw.ar(LFNoise1.kr(1).range(20,2250))}.play;
+a = Spectrogram.new(w, Rect(10, 10, 580, 280))
+)
+
+a.start
+
+a.isRunning
+
+{Saw.ar(LFNoise1.kr(1).range(20,2250))}.play
+
+a.stop
+
+a.isRunning
 ::
 
 
@@ -62,6 +73,9 @@ Starts analysis and drawing.
 METHOD:: stop
 Stop analysis and drawing.
 
+METHOD:: isRunning
+A Boolean, true if the spectrogram is active or false if the spectrogram has been stopped.
+
 METHOD:: setBufSize
 Set the buffer size of the fft window.
 
diff --git a/Spectrogram.sc b/Spectrogram.sc
index 85593ae..973f86c 100644
--- a/Spectrogram.sc
+++ b/Spectrogram.sc
@@ -41,7 +41,7 @@ Spectrogram {
 		this.setUserView(window, bounds);
 		window.onClose_({
 			image.free;
-			this.stopruntask;
+			if(this.isRunning) { this.stopruntask };
 			fftbuf.free;
 		}).front;
 	}
@@ -216,6 +216,7 @@ Spectrogram {
 
 	stop { this.stopruntask }
 
+	isRunning { ^running }
 }
 
 SpectrogramWindow : Spectrogram {
@@ -371,7 +372,7 @@ SpectrogramWindow : Spectrogram {
 			try{ fftSynth.free };
 			try{ fftbuf.free };
 			scopeOpen = false;
-			this.stopruntask;
+			if(this.isRunning) { this.stopruntask };
 			CmdPeriod.remove(cper);
 		}).front;
 	}