diff --git a/js/CommonComponents.js b/js/CommonComponents.js
index 3fa9cad..6bd133f 100644
--- a/js/CommonComponents.js
+++ b/js/CommonComponents.js
@@ -261,5 +261,7 @@ function Hint(props) {
         return (
             <h3>{ props.hint }</h3>
         );
+    } else {
+        return null;
     }
 }