Merge pull request #189 from exentrich/patch-1

Author: andresin87

src/react-sortable.tsx

@@ -115,7 +115,9 @@ Please read the updated README.md at https://github.com/SortableJS/react-sortabl
     const dataid = dataIdAttr || "data-id";
     /* eslint-disable-next-line */
     return Children.map(children as ReactElement<any>[], (child, index) => {
-      const item = list[index];
+      if (child === undefined) return undefined
+      
+      const item = list[index] || {};
       const { className: prevClassName } = child.props;
 
       // @todo - handle the function if avalable. I don't think anyone will be doing this soon.