TypeError: e.css.split is not a function

TypeError: e.css.split is not a function, this error is shown when I imported the new xlsx file in dhx plugin and want to change content present in cell of excel sheet. this error is also coming when tab button is pressed.

thank you for your report. The porblem is confirmed. We’ll try to fix it in one of the future updates.

We have fixed that problem i nthe latest 4.1.1 dhtmlxSpreadsheet update.
Thank you once again for your report.