Heloc - Outstanding Mortgage Principal

I have a 1098 form from a HELOC.  The 1098 does not show box 2 original mortgage principal.  I withdrew funds on 1/17/18.  So my outstanding mortgage principal on 1/1/18 is 0.  Turbo Tax is giving me errors saying I must have a value.  Technically I did have a 0 dollar balance on 1/1/18. I paid back the funds on 3/23/18.