GSTR 1 FOR FY 2018-19

For FY 2018-19, by mistake I had selected monthly GSTR1 but filed on quarterly base (turnover was 40lakh). When I am going to file GSTR 9, It is showing GSTR 1 has not been filled and not showing auto populated data. Should I leave annual return (as optional to file less than 2 crore) or file NIL GSTR 1 for balance 8 months and file annual return. Kindly suggest. Please do reply.