Just checking for null sound reference isn't enough since because calling play() on already playing sound is not covered by that condition

Author: pavle-goloskokovic

v3/src/sound/webaudio/WebAudioSound.js

@@ -110,7 +110,7 @@ var WebAudioSound = new Class({
         this.source.connect(this.muteNode);
         this.applyConfig();
         this.source.onended = function (ev) {
-            if (this.source) {
+            if (this.source && ev.target === this.source) {
                 this.stop();
             }
         }.bind(this);