According to the instructions for box 15b, it should have something in box 7. I think the only option you have is to go back to the issuer and have them fix it.
This, from the instructions for Form 1099:
Box 15b. Shows income as a nonemployee under an NQDC plan that does not
meet the requirements of section 409A. This amount also is included in box 7 as
nonemployee compensation. Any amount included in box 15a that is currently
taxable also is included in this box. This income also is subject to a substantial
additional tax to be reported on Form 1040 (or Form 1040NR). See the Form
1040 (or Form 1040NR) instructions.
