diff --git a/core/modules/big_pipe/tests/src/FunctionalJavascript/BigPipeRegressionTest.php b/core/modules/big_pipe/tests/src/FunctionalJavascript/BigPipeRegressionTest.php
index b4da7b0a9b..3930c97ede 100644
--- a/core/modules/big_pipe/tests/src/FunctionalJavascript/BigPipeRegressionTest.php
+++ b/core/modules/big_pipe/tests/src/FunctionalJavascript/BigPipeRegressionTest.php
@@ -107,8 +107,10 @@ public function testCommentForm_2698811() {
     $this->drupalGet($node->toUrl()->toString());
     // Confirm that CKEditor loaded.
     $javascript = <<<JS
-    (function(){
-      return Object.keys(CKEDITOR.instances).length > 0;
+    (function() {
+      return typeof CKEDITOR !== 'undefined'
+        && typeof CKEDITOR.instances !== 'undefined'
+        && Object.keys(CKEDITOR.instances).length > 0;
     }());
 JS;
     $this->assertJsCondition($javascript);