GST paid on advance adjustment

suppose I had received 10 Lacs in advance in October for which I have already paid the GST in October, now in November my sale is 8 Lacs, so I not need to pay GST on 8 lacs. But when I file my 3b and show 8 my sale for Nov month and zero CGST AND SCGST in 3b it not accepting 0 in tax coloum saying tax coloumn could not be zero if you have taxable supply. Now there is any way to file 3b without paying any tax or I have to pay some tax to file 3b ?