diff --git a/docs/src/assets/js/playground.js b/docs/src/assets/js/playground.js
index 3a410595..7c4e7bd2 100644
--- a/docs/src/assets/js/playground.js
+++ b/docs/src/assets/js/playground.js
@@ -180,7 +180,7 @@ window.initializePlayground = async (opts) => {
   accessibilityCheckbox.addEventListener("change", handleQueryChange);
   languageSelect.addEventListener("change", handleLanguageChange);
   outputContainer.addEventListener("click", handleTreeClick);
-  copyButton.addEventListener("click", handleCopy);
+  copyButton?.addEventListener("click", handleCopy);
 
   handleQueryEnableChange();
   await handleLanguageChange();