example: add ref checking condition (#1504)

vercel · Sep 28, 2021 · b6855b7 · b6855b7
1 parent 6746f49
commit b6855b7
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/examples/infinite-scroll/hooks/useOnScreen.js b/examples/infinite-scroll/hooks/useOnScreen.js
@@ -4,6 +4,8 @@ export default function useOnScreen(ref) {
   const [isIntersecting, setIntersecting] = useState(false)
 
   useEffect(() => {
+    if (!ref.current) return
+
     const observer = new IntersectionObserver(([entry]) =>
       setIntersecting(entry.isIntersecting)
     )