diff --git a/src/components/page-react-timings/App.tsx b/src/components/page-react-timings/App.tsx
index 42c1e8a..59add50 100644
--- a/src/components/page-react-timings/App.tsx
+++ b/src/components/page-react-timings/App.tsx
@@ -133,6 +133,7 @@ class ClassWithMetrics extends React.Component<{
 
   override getSnapshotBeforeUpdate() {
     this.boundLog("getSnapshotBeforeUpdate");
+    return "";
   }
 
   override componentWillUnmount() {