Follow-up Comment #2, bug #24131 (project relax):
This was fast!
I attached a file ("two_spins.bz2") with two residues, residue 6 (without an
s2 parameter) and residue 7 (with an s2 parameter). 
After deleting the spin with the missing value, write.bmrb went through just
fine. So I suppose the problem ist the missing value.
(file #25870, file #25871)
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Additional Item Attachment:
File name: bmrb-deposition.py             Size:1 KB
File name: two_spins.bz2                  Size:43 KB
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