У вашего броузера проблема в совместимости с HTML5
when you dont have outward supplies for particular tax period you need to file nil GSTR1 of for that period.
how to save turnover data on gst website clear Error message that there is no summary to submit
click here to read Article on How to file Nil GSTR1 return https://pgallinone.blogspot.com/2017/09/how-to-file-nil-gstr1-return.html
Live Demo How to file GSTR3B return online https://youtu.be/wD4IiqeRsnI