Income tax notice u/s 139

I received notice u/s 139(9) for defective return in the month of October, as I declared Income by mistake in business code.

But by mistake I did not read the email and not rectified the return.

In the month of December I received Intimation u/s 143(1) and no penalty or interest or tax is due as per intimation.

Now I want to ask that is there any need to file revised the ITR as the mistake is minor but also the time limit to rectify the ITR has gone because notice was for m/o October to rectify.

Please help, its urgent... Thank you