I showed dependent on 2017 but not for 2018 so why is it asking me for dependent's modified AGI?

[jrs1271]

Turbo Tax will not let me e-file because it's asking for dependent's modified AGI when I am not reporting a dependent on my 2018 return

[KatieB1]

The IRS asks for previous year's AGI as a means to verify your identity. 

https://www.efile.com/adjusted-gross-income-or-agi/