File GSTR-3B for Sept when GSTR-3B for Aug is not filed.

Divyam Goel (Chartered Accountant) (36 Points)

20 October 2017  
I have entered a wrong amount of tax in gstr-3b of aug and hence I have only submitted the return and haven't filed it.
Now how can I file the return of sept as aug return is not filed!!!!!
please help!