paying gaps 2020 to 2021

Hi, I was checking my Your National Insurance record, and it says that there is a gap in 2020 to 2021, but I wasn't working during that time. How can this be fixed?

Hi 
If you were not working or claiming any type of a benefit during the tax year, you could make a voluntary National Insurance Payment to fill up the gap.
If you wish to do so, the first step of the process is to contact the Future Pensions Centre., they will advise you on the amount that will need to be paid and
also whether it would be worth paying.
Please find the contact details for the future pension centre in the link below:
Contact the Future Pension Centre
Thank you.