Index: ssts-web/src/main/webapp/js/speaker.js
===================================================================
diff -u -r29285 -r29289
--- ssts-web/src/main/webapp/js/speaker.js	(.../speaker.js)	(revision 29285)
+++ ssts-web/src/main/webapp/js/speaker.js	(.../speaker.js)	(revision 29289)
@@ -431,7 +431,9 @@
 	if(!!window.ActiveXObject || "ActiveXObject" in window){
 		var html = '<bgsound autostart="true" loop="0" src="'+WWWROOT+'/disinfectsystem/touchScreen/recycle/audio/simpleTips.wav">';
 		document.getElementById(ids).innerHTML = html;
-		document.getElementById('invoicePlanAudioIE').src = WWWROOT+'/disinfectsystem/touchScreen/recycle/audio/simpleTips.wav';
+		if(document.getElementById('invoicePlanAudioIE')){
+			document.getElementById('invoicePlanAudioIE').src = WWWROOT+'/disinfectsystem/touchScreen/recycle/audio/simpleTips.wav';
+		}
 	}else {
 		var html = '<video autoplay src="'+WWWROOT+'/disinfectsystem/touchScreen/recycle/audio/simpleTips.wav"></video>';
 		document.getElementById(ids).innerHTML = html;