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/view/main/MainController.js b/app/view/main/MainController.js
index ab93b03d..7fc34cda 100644
--- a/app/view/main/MainController.js
+++ b/app/view/main/MainController.js
@@ -236,6 +236,8 @@ 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: