diff --git a/chrome/browser/ui/web_applications/app_browser_controller.cc b/chrome/browser/ui/web_applications/app_browser_controller.cc
index c32c5a24a523c..032d03eebf79d 100644
--- a/chrome/browser/ui/web_applications/app_browser_controller.cc
+++ b/chrome/browser/ui/web_applications/app_browser_controller.cc
@@ -286,7 +286,11 @@ AppBrowserController::~AppBrowserController() {
 
 bool AppBrowserController::ShouldShowCustomTabBar() const {
   if (!IsInstalled()) {
-    return false;
+    // Fail safe: the Custom Tab Bar is the only persistent origin indicator
+    // for omnibox-less TYPE_APP windows. If the registrar entry is gone (e.g.
+    // a beforeunload-cancelled close after uninstall left this window alive),
+    // we cannot evaluate scope, so always surface the origin to the user.
+    return true;
   }
 
   content::WebContents* web_contents =