Box 16 on W2

I am working on my daughter's taxes (she is 17) and we live in NH with no state income tax but her employer but in amount for box 16.  It's the same amount as in box 1.  They entered in NH under state for box 15 but left the Employer's State ID number blank and box 17 for State Income tax is also blank.  Turbotax won't process her taxes because of this.  Is it an error on her employer's side?  I don't know why they would put in some information but not all???