It depends. Social security income is always reported on the tax return, but is not always taxable.
It's a complicated formula, but this link provides additional information: Is my social security taxable?
In general, if you had very little other income, your Social Security Benefits may well not be taxable, and the $0 you see on line 5b is probably correct.
[Edited 2/23/2020 | 8:52 PM PST]
@khedley
