diff --git a/js/panel_controller.js b/js/panel_controller.js
index 40f405c48f..b8b4b1ab32 100644
--- a/js/panel_controller.js
+++ b/js/panel_controller.js
@@ -130,7 +130,6 @@
                 inboxWindowId = windowInfo.id;
 
                 windowInfo.onClosed.addListener(function () {
-                    inboxWindowId = 0;
                     inboxOpened = false;
                 });