First company send me 1098 with a value on box 2, the second company that took over the mortgage on Oct send 1098 with a $0.0 value on box 2 what amount should I enter?

Mortgage was sold around the end of the year

first mortgage company send 1098 with amount on box 2, second company amount on box 2 is $0.00  

when I enter info on TurboTax for the second lender it will not let me continue with a message that says "outstanding mortgage principal must have a value", what do I enter there then?

Should I enter the ending mortgage balance giving in the end of the first 1098?