diff --git a/playground/components/Tab.tsx b/playground/components/Tab.tsx
index 0a46bd414..2a5eb5ff9 100644
--- a/playground/components/Tab.tsx
+++ b/playground/components/Tab.tsx
@@ -19,7 +19,7 @@ class Tab extends Component<TabProps> {
         <TabLink
           onClick={(event) => {
             event.preventDefault();
-            if (parentCallback && tabIndex) {
+            if (parentCallback && tabIndex !== undefined) {
               parentCallback(tabIndex);
             }
           }}