diff --git a/app/package.json b/app/package.json
index d305d865..ec984b65 100644
--- a/app/package.json
+++ b/app/package.json
@@ -1,7 +1,7 @@
 {
 	"name": "Rambox",
 	"productName": "Rambox",
-	"version": "0.5.11",
+	"version": "0.5.12",
 	"description": "Rambox",
 	"main": "electron/main.js",
 	"private": true,
diff --git a/app/store/ServicesList.js b/app/store/ServicesList.js
index b8968405..9890b99c 100644
--- a/app/store/ServicesList.js
+++ b/app/store/ServicesList.js
@@ -38,7 +38,7 @@ Ext.define('Rambox.store.ServicesList', {
 			,description: locale['services[1]']
 			,url: 'https://___.slack.com/'
 			,type: 'messaging'
-			,js_unread: 'function checkUnread(){var e=$(".p-channel_sidebar__channel--unread").length,a=0;$(".p-channel_sidebar__badge").each(function(){a+=isNaN(parseInt($(this).html()))?0:parseInt($(this).html())}),updateBadge(e,a)}function updateBadge(e,a){var n=a>0?"("+a+") ":e>0?"(•) ":"";document.title=n+originalTitle}var originalTitle=document.title;setInterval(checkUnread,3e3);'
+			,js_unread: 'function checkUnread(){var e=$(".p-channel_sidebar__channel--unread:not(.p-channel_sidebar__channel--muted)").length,a=0;$(".p-channel_sidebar__badge").each(function(){a+=isNaN(parseInt($(this).html()))?0:parseInt($(this).html())}),updateBadge(e,a)}function updateBadge(e,a){var n=a>0?"("+a+") ":e>0?"(•) ":"";document.title=n+originalTitle}var originalTitle=document.title;setInterval(checkUnread,3e3);'
 		},
 		{
 			 id: 'noysi'
diff --git a/app/view/main/MainController.js b/app/view/main/MainController.js
index 24f65487..c7fe5a46 100644
--- a/app/view/main/MainController.js
+++ b/app/view/main/MainController.js
@@ -273,6 +273,8 @@ Ext.define('Rambox.view.main.MainController', {
 			// Get Tab
 			var tab = Ext.getCmp('tab_'+serviceId);
 
+			if ( !tab ) return; // Skip disabled services
+
 			// Mute sounds
 			tab.setAudioMuted(btn.pressed ? true : tab.record.get('muted'), true);
 
diff --git a/appveyor.yml b/appveyor.yml
index 3eb8546e..892787c7 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,4 +1,4 @@
-version: 0.5.11
+version: 0.5.12
 pull_requests:
   do_not_increment_build_number: true
 branches: