Handsontable in popup window

Getting help Issues
15

getting same issue

handsontable.full.min.js:400 Uncaught TypeError: Cannot read property ‘length’ of null
at i.setDataAtCell (handsontable.full.min.js:400)
at n.r [as validator] (handsontable.full.min.js:405)
at handsontable.full.min.js:400