Error while Adding Original for a Replication

[Rohan-Tondlekar]

I received an error while Adding Original for a replication in Zotero: https://rep-api.forrt.org/v1/original-lookup?dois=10.1007/s13164-018-0400-9

{
"doi": "10.5840/jphil20091061128",
"doi_hash": "38c",
"title": "Cause and Norm",
"authors": [
{
"given": "Christopher",
"family": "Hitchcock",
"sequence": "first"
},
{
"given": "Joshua",
"family": "Knobe",
"sequence": "additional"
},
{
"sequence": "additional"
}
],
"journal": "Journal of Philosophy",
"year": 2009,
"volume": "106",
"issue": "11",
"pages": "587-612",
"apa_ref": "Hitchcock, C., & Knobe, J. (2009). Cause and Norm. Journal of Philosophy, 106(11), 587–612. https://doi.org/10.5840/jphil20091061128",
"bibtex_ref": "@Article{Hitchcock_2009, title={Cause and Norm}, volume={106}, ISSN={0022-362X}, url={http://dx.doi.org/10.5840/jphil20091061128}, DOI={10.5840/jphil20091061128}, number={11}, journal={Journal of Philosophy}, publisher={Philosophy Documentation Center}, author={Hitchcock, Christopher and Knobe, Joshua}, year={2009}, pages={587–612} }",
"outcome": "successful"
}

Upon closer inspection I noticed that this happened because one of the author data is blank
{
"sequence": "additional"
}