The Wikipedia page on J-couplings states that
Scalar or J-couplings (also called indirect dipole dipole coupling) are mediated through chemical bonds connecting two spins. It is an indirect interaction between two nuclear spins which arises from hyperfine interactions between the nuclei and local electrons.
My question is: provided that J-couplings are some metric for hyperfine interactions between electron spins and nuclear spins, is there something special we can say regarding J-couplings between two atoms in a lattice with even integer mass numbers, i.e. where the nuclei of both atoms have a spin quantum number of zero? Shouldn't the lack of a nuclear spin on both bonded atoms abrogate any j-coupling term?