I think it should be let* instead of let because function bibtex-completion-find-pdf will use variable bibtex-completion-bibliograph. Otherwise, if org-ref uses a different bib file from bibTeX-completion, a warning of "Bibtex-completion couldn't find entry with key" will occur.
I think it should be
let*
instead oflet
because functionbibtex-completion-find-pdf
will use variablebibtex-completion-bibliograph
. Otherwise, if org-ref uses a different bib file from bibTeX-completion, a warning of "Bibtex-completion couldn't find entry with key" will occur.https://github.com/jkitchin/org-ref/blob/195b8d3209aff956ecdd755422700e8517a34d11/org-ref-citation-links.el#L595