diff --git a/facebook-notification.user.js b/facebook-notification.user.js
index 8c42c8f..484ae82 100644
--- a/facebook-notification.user.js
+++ b/facebook-notification.user.js
@@ -1,7 +1,7 @@
 // ==UserScript==
 // @name          Facebook desktop notification
 // @namespace     https://www.schtobia.de/
-// @version       0.1.1
+// @version       0.2.0
 // @description   Facebook desktop notification (based on HTML5)
 // @include       http*://www.facebook.com/*
 // @include       http*://facebook.com/*
@@ -32,6 +32,14 @@ var intervalID = null;
 
 notify = function()
 {
+	if (friendRequestsElement == null || messagesElement == null || notificationsElement == null)
+	{
+		console.log(GM_info.script.name + ": One of the DOM nodes is empty! Clearing the interval timer " + intervalID + "!");
+		clearInterval(intervalID);
+		intervalID = null;
+		return;
+	}
+
 	newFriendRequests = friendRequestsElement.innerHTML;
 	newMessages = messagesElement.innerHTML;
 	newNotifications = notificationsElement.innerHTML;
diff --git a/googleplus-notification.user.js b/googleplus-notification.user.js
index f5b687d..dd0207e 100644
--- a/googleplus-notification.user.js
+++ b/googleplus-notification.user.js
@@ -1,7 +1,7 @@
 // ==UserScript==
 // @name          Google+ desktop notification
 // @namespace     https://www.schtobia.de/
-// @version       0.1.1
+// @version       0.2.0
 // @description   Google+ desktop notification (based on HTML5)
 // @include       http*://plus.google.com/*
 // @grant         GM_getValue
@@ -25,6 +25,14 @@ var intervalID = null;
 
 notify = function()
 {
+	if (notificationsElement == null)
+	{
+		console.log(GM_info.script.name + ": The DOM node is empty! Clearing the interval timer " + intervalID + "!");
+		clearInterval(intervalID);
+		intervalID = null;
+		return;
+	}
+
 	newNotifications = notificationsElement.innerHTML;
 
 	if (newNotifications > lastNotifications)