diff --git a/src/applications/auth/controller/PhabricatorLogoutController.php b/src/applications/auth/controller/PhabricatorLogoutController.php
--- a/src/applications/auth/controller/PhabricatorLogoutController.php
+++ b/src/applications/auth/controller/PhabricatorLogoutController.php
@@ -4,7 +4,10 @@
   extends PhabricatorAuthController {
 
   public function shouldRequireLogin() {
-    return true;
+    // See T13310. We allow access to the "Logout" controller even if you are
+    // not logged in so you can log out even if you do not have access to any
+    // Spaces.
+    return false;
   }
 
   public function shouldRequireEmailVerification() {