diff --git a/1-js/04-object-basics/07-optional-chaining/article.md b/1-js/04-object-basics/07-optional-chaining/article.md
index 5bcaba59e2..51cf195b46 100644
--- a/1-js/04-object-basics/07-optional-chaining/article.md
+++ b/1-js/04-object-basics/07-optional-chaining/article.md
@@ -103,7 +103,7 @@ The code is short and clean, there's no duplication at all.
 Here's an example with `document.querySelector`:
 
 ```js run
-let html = document.querySelector('.elem')?.innerHTML; // will be null, if there's no element
+let html = document.querySelector('.elem')?.innerHTML; // will be undefined, if there's no element
 ```
 
 Reading the address with `user?.address` works even if `user` object doesn't exist: