diff --git a/src/VirtualList.js b/src/VirtualList.js
index a2a74d5..81e1c02 100644
--- a/src/VirtualList.js
+++ b/src/VirtualList.js
@@ -53,7 +53,7 @@ const VirtualList = (options, mapVirtualToProps = defaultMapToVirtualProps) => (
       // get first and lastItemIndex
       const state = getVisibleItemBounds(list, container, items, itemHeight, itemBuffer);
 
-      if (state === undefined) { return; }
+      if (state == null) { return; }
       
       if (state.firstItemIndex > state.lastItemIndex) { return; }