Merge pull request #49 from andrwh/patch-1

Fixes multiple lists

Author: developerdizzle

src/VirtualList.js

@@ -50,6 +50,8 @@ const VirtualList = (options, mapVirtualToProps = defaultMapToVirtualProps) => (
     setStateIfNeeded(list, container, items, itemHeight, itemBuffer) {
       // get first and lastItemIndex
       const state = getVisibleItemBounds(list, container, items, itemHeight, itemBuffer);
+      
+      if (state.firstItemIndex > state.lastItemIndex) { return; }
 
       if (state !== undefined && (state.firstItemIndex !== this.state.firstItemIndex || state.lastItemIndex !== this.state.lastItemIndex)) {
         this.setState(state);