Hikashop Dashboard Line Chart Bug

-- HikaShop version -- : hikashop business 3.4
-- Joomla version -- : Joomla! 3.9

when login to backend, the hikashop dashboard line chart is not working and showing b.split is not function by default, after filter the period at the dropdown it will showing the line chart. However when hover on the chart, the total sales amount tooltip at the hovered date is not showing.how can i fix this?