diff --git a/index.html b/index.html
index afe9cb3..d3828d4 100644
--- a/index.html
+++ b/index.html
@@ -12,6 +12,15 @@
   	</style>
 	<link rel="icon" type="image/x-icon" href="./favicon.ico">
 	<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
+	<script type="text/javascript">
+	  	// to avoid the error, the parameter [sendResponse] is necessary!
+		chrome.runtime.onMessage.addListener(function(msg, sender, sendResponse) {
+  			// do something ...
+
+  			// this line seems meaningless but you have to invoke it to avoid error.
+  			sendResponse({damn: true});
+		});
+	</script>
   </head>
 
   <body>
@@ -55,6 +64,7 @@ <h4><a title="You can open other new Stream in Browser as new tab" href="https:/
 	var context;
 	var source;
 	var _chat_Channel;
+
 	    
    
 	function err_Handler(err) {
