refreshVirtualList报错

【egret】
list使用refreshVirtualList()刷新列表
报错：
Uncaught TypeError: Cannot read property '0' of undefined
at GList.handleScroll1 (fairygui.js?v=1564021643817:10477)
at GList.handleScroll (fairygui.js?v=1564021643817:10335)
at GList._refreshVirtualList (fairygui.js?v=1564021643817:10207)
at GTimers.__timer (fairygui.js?v=1564021643817:12552)
at SystemTicker.update (egret.js?v=1564021643817:14222)
at onTick (egret.web.js?v=1564021643817:3666)

这个是什么原因啊？？？