diff --git a/core/modules/system/tests/src/Kernel/Form/ExternalFormUrlTest.php b/core/modules/system/tests/src/Kernel/Form/ExternalFormUrlTest.php
index e756374..0d161a2 100644
--- a/core/modules/system/tests/src/Kernel/Form/ExternalFormUrlTest.php
+++ b/core/modules/system/tests/src/Kernel/Form/ExternalFormUrlTest.php
@@ -76,7 +76,11 @@ public function testActionUrlBehavior() {
     // Create a new request which has a request uri with multiple leading
     // slashes and make it the master request.
     $request_stack = \Drupal::service('request_stack');
+    /** @var \Symfony\Component\HttpFoundation\RequestStack $original_request */
     $original_request = $request_stack->pop();
+    // Just request some more so there is no request left.
+    $request_stack->pop();
+    $request_stack->pop();
     $request = Request::create($original_request->getSchemeAndHttpHost() . '//example.org');
     $request_stack->push($request);