diff --git a/file/js/be.bastelstu.Chat.litcoffee b/file/js/be.bastelstu.Chat.litcoffee
index aaf448b..4fa3a6e 100644
--- a/file/js/be.bastelstu.Chat.litcoffee
+++ b/file/js/be.bastelstu.Chat.litcoffee
@@ -315,11 +315,11 @@ Scroll down when autoscroll is being activated.
 
 Enable duplicate tab detection.
 
-			window.localStorage.setItem 'be.bastelstu.chat.session', chatSession
-			$(window).on 'storage', (event) ->
-				if event.originalEvent.key is 'be.bastelstu.chat.session'
-					if parseInt(event.originalEvent.newValue) isnt chatSession
-						showError WCF.Language.get 'chat.error.duplicateTab'
+			try
+				window.localStorage.setItem 'be.bastelstu.chat.session', chatSession
+				$(window).on 'storage', (event) ->
+					if event.originalEvent.key is 'be.bastelstu.chat.session'
+						showError WCF.Language.get 'chat.error.duplicateTab' if parseInt(event.originalEvent.newValue) isnt chatSession
 
 Ask for permissions to use Desktop notifications when notifications are activated.