'Semantic scholar' error

I'm getting an unspecified error trying to save:

https://www.semanticscholar.org/paper/The-uses-of-Wikidata-for-galleries,-libraries,-and-Cook/65f436390e0129e016c6596c5e190ff2aea1f1e9

via the "Semantic Scholar" translator, using 5.0.66 under Firefox 66.0.3 (64-bit) and Windows 10. It falls back to using the "embedded metadata".
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