The value is not a valid url. Maybe try a scihub mirror or another instance of WhereIsSciHub like:

  • https://sci-hub.se/
  • https://whereisscihub-rf7h2bfl8.now.sh/go/
You can also get a scihub url from where WISH fetch them: on Wikidata

If you think this is a valid url, please open an issue/bug report at:
https://github.com/RoiArthurB/Side-Auto_Sci-Hub/issues