diff --git a/src/web/client/license_timer.html b/src/web/client/license_timer.html
index 4b697a0..9642029 100644
--- a/src/web/client/license_timer.html
+++ b/src/web/client/license_timer.html
@@ -82,18 +82,31 @@
 			var timeOutEventID;
 
 			function ShowNotifyTimeOver(timeLeft) {
-				if(Notification) {	// except IE
-					Notification.requestPermission(function (result) {
-						Notification.permission = result;
+				var isNotificationIsSupported = !!(window.Notification /* W3C Specification */ || win.webkitNotifications /* old WebKit Browsers */ || navigator.mozNotification /* Firefox for Android and Firefox OS */) 
 
-						console.log(result);
-						if(result !== "denied")
+				if(isNotificationIsSupported) {
+					if(Notification) {	// prepared browser for using Notification
+						if(Notification.permission === "granted") {
 							AddNotifyEventByNotification(timeLeft);
-						else
+							return;
+						}
+
+						Notification.requestPermission(function (result) {
+							Notification.permission = result;
+
+							if(result === "granted") {
+								AddNotifyEventByNotification(timeLeft);
+								return;
+							}
+
 							AddNotifyEventByAlert(timeLeft);
-					});
-				} else {	// IE
-					console.log("no notification");
+						});
+					} else {	// not prepared browser for using Notification
+						console.log("no notification - !Notification");
+						AddNotifyEventByAlert(timeLeft);
+					}
+				} else {	// not prepared browser for using Notification - IE
+					console.log("no notification - Notification in window");
 					AddNotifyEventByAlert(timeLeft);
 				}
 			}