diff --git a/Tone/source/Microphone.js b/Tone/source/Microphone.js
index f4b3ae74..59a2dc94 100644
--- a/Tone/source/Microphone.js
+++ b/Tone/source/Microphone.js
@@ -90,8 +90,9 @@ define(["Tone/core/Tone", "Tone/source/Source"], function(Tone){
 	 */
 	Tone.Microphone.prototype.dispose = function() {
 		Tone.Source.prototype.dispose.call(this);
-		//this._stream.disconnect();
-		this._mediaStream.disconnect();
+		if (this._mediaStream) {
+			this._mediaStream.disconnect();
+		}
 		this._stream = null;
 		this._mediaStream = null;
 	};